1623420 has 72 divisors (see below), whose sum is σ = 5110560. Its totient is φ = 416640.

The previous prime is 1623403. The next prime is 1623421. The reversal of 1623420 is 243261.

1623420 = T₃₂₀ + T₃₂₁ + ... + T₃₄₈.

It is a happy number.

1623420 is a `hidden beast` number, since 1 + 623 + 42 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1623393 and 1623402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5065 + ... + 5375.

It is an arithmetic number, because the mean of its divisors is an integer number (70980).

2^1623420 is an apocalyptic number.

1623420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1623420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2555280).

1623420 is an abundant number, since it is smaller than the sum of its proper divisors (3487140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1623420 is a wasteful number, since it uses less digits than its factorization.

1623420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1623420 is about 1274.1350006966. The cubic root of 1623420 is about 117.5286183498.

Adding to 1623420 its reverse (243261), we get a palindrome (1866681).

It can be divided in two parts, 16 and 23420, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 1623420 in words is "one million, six hundred twenty-three thousand, four hundred twenty".