1620372 has 72 divisors (see below), whose sum is σ = 4427136. Its totient is φ = 459264.

The previous prime is 1620371. The next prime is 1620379. The reversal of 1620372 is 2730261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34453 + ... + 34499.

It is an arithmetic number, because the mean of its divisors is an integer number (61488).

2^1620372 is an apocalyptic number.

1620372 is a gapful number since it is divisible by the number (12) 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 1620372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213568).

1620372 is an abundant number, since it is smaller than the sum of its proper divisors (2806764).

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

1620372 is a wasteful number, since it uses less digits than its factorization.

1620372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 1620372 is about 1272.9383331489. The cubic root of 1620372 is about 117.4550182431.

The spelling of 1620372 in words is "one million, six hundred twenty thousand, three hundred seventy-two".