40402056 has 64 divisors (see below), whose sum is σ = 108964800. Its totient is φ = 12441600.

The previous prime is 40402051. The next prime is 40402057. The reversal of 40402056 is 65020404.

Added to its reverse (65020404) it gives a triangular number (105422460 = T₁₄₅₂₀).

It is a happy number.

It is a super-2 number, since 2×40402056² = 3264652258054272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40402051) 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 15 ways as a sum of consecutive naturals, for example, 17616 + ... + 19776.

It is an arithmetic number, because the mean of its divisors is an integer number (1702575).

Almost surely, 2^40402056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40402056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54482400).

40402056 is an abundant number, since it is smaller than the sum of its proper divisors (68562744).

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

40402056 is a wasteful number, since it uses less digits than its factorization.

40402056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230 (or 2226 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40402056 is about 6356.2611651819. The cubic root of 40402056 is about 343.1372150024.

Adding to 40402056 its reverse (65020404), we get a triangular number (105422460 = T₁₄₅₂₀).

The spelling of 40402056 in words is "forty million, four hundred two thousand, fifty-six".