40721936 has 20 divisors (see below), whose sum is σ = 83540412. Its totient is φ = 19163136.

The previous prime is 40721929. The next prime is 40721969. The reversal of 40721936 is 63912704.

It can be written as a sum of positive squares in 2 ways, for example, as 14137600 + 26584336 = 3760^2 + 5156^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74585 + ... + 75128.

Almost surely, 2^40721936 is an apocalyptic number.

It is an amenable number.

40721936 is an abundant number, since it is smaller than the sum of its proper divisors (42818476).

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

40721936 is a wasteful number, since it uses less digits than its factorization.

40721936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149738 (or 149732 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 40721936 is about 6381.3741466866. The cubic root of 40721936 is about 344.0404225079.

The spelling of 40721936 in words is "forty million, seven hundred twenty-one thousand, nine hundred thirty-six".