1236420 has 36 divisors (see below), whose sum is σ = 3751020. Its totient is φ = 329664.

The previous prime is 1236419. The next prime is 1236439. The reversal of 1236420 is 246321.

It is a happy number.

1236420 is a `hidden beast` number, since 1 + 23 + 642 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 171396 + 1065024 = 414^2 + 1032^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 1236393 and 1236402.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3255 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (104195).

2^1236420 is an apocalyptic number.

1236420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1236420 is an abundant number, since it is smaller than the sum of its proper divisors (2514600).

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

1236420 is a wasteful number, since it uses less digits than its factorization.

1236420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884 (or 6879 counting only the distinct ones).

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

The square root of 1236420 is about 1111.9442432065. The cubic root of 1236420 is about 107.3302169365.

Subtracting from 1236420 its reverse (246321), we obtain a palindrome (990099).

The spelling of 1236420 in words is "one million, two hundred thirty-six thousand, four hundred twenty".