40556979 has 6 divisors (see below), whose sum is σ = 58582316. Its totient is φ = 27037980.

The previous prime is 40556969. The next prime is 40556983. The reversal of 40556979 is 97965504.

It is a happy number.

40556979 is a `hidden beast` number, since 4 + 0 + 556 + 97 + 9 = 666.

It is not a de Polignac number, because 40556979 - 2¹⁶ = 40491443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40556969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2253157 + ... + 2253174.

Almost surely, 2^40556979 is an apocalyptic number.

40556979 is a deficient number, since it is larger than the sum of its proper divisors (18025337).

40556979 is a wasteful number, since it uses less digits than its factorization.

40556979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506337 (or 4506334 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 40556979 is about 6368.4361502648. The cubic root of 40556979 is about 343.5752458740.

The spelling of 40556979 in words is "forty million, five hundred fifty-six thousand, nine hundred seventy-nine".