40556506 has 4 divisors (see below), whose sum is σ = 60834762. Its totient is φ = 20278252.

The previous prime is 40556497. The next prime is 40556513. The reversal of 40556506 is 60565504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22992025 + 17564481 = 4795^2 + 4191^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139125 + ... + 10139128.

Almost surely, 2^40556506 is an apocalyptic number.

40556506 is a deficient number, since it is larger than the sum of its proper divisors (20278256).

40556506 is a wasteful number, since it uses less digits than its factorization.

40556506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20278255.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 40556506 is about 6368.3990138810. The cubic root of 40556506 is about 343.5739102081.

The spelling of 40556506 in words is "forty million, five hundred fifty-six thousand, five hundred six".