126921636 has 36 divisors (see below), whose sum is σ = 334780992. Its totient is φ = 40467504.

The previous prime is 126921629. The next prime is 126921703. The reversal of 126921636 is 636129621.

It is a happy number.

126921636 is a `hidden beast` number, since 12 + 6 + 9 + 2 + 1 + 636 = 666.

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

It is a super-2 number, since 2×126921636² = 32218203369832992, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 126921636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75816 + ... + 77471.

It is an arithmetic number, because the mean of its divisors is an integer number (9299472).

Almost surely, 2^126921636 is an apocalyptic number.

It is an amenable number.

126921636 is an abundant number, since it is smaller than the sum of its proper divisors (207859356).

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

126921636 is a wasteful number, since it uses less digits than its factorization.

126921636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153320 (or 153315 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 126921636 is about 11265.9502928071. The cubic root of 126921636 is about 502.5491627848.

The spelling of 126921636 in words is "one hundred twenty-six million, nine hundred twenty-one thousand, six hundred thirty-six".