40779931 has 4 divisors (see below), whose sum is σ = 40794832. Its totient is φ = 40765032.

The previous prime is 40779929. The next prime is 40779961. The reversal of 40779931 is 13997704.

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

It is a cyclic number.

It is not a de Polignac number, because 40779931 - 2¹ = 40779929 is a prime.

It is a super-2 number, since 2×40779931² = 3326005544729522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40779961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031 + ... + 9256.

It is an arithmetic number, because the mean of its divisors is an integer number (10198708).

Almost surely, 2^40779931 is an apocalyptic number.

40779931 is a deficient number, since it is larger than the sum of its proper divisors (14901).

40779931 is a wasteful number, since it uses less digits than its factorization.

40779931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14900.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 40779931 is about 6385.9166139247. The cubic root of 40779931 is about 344.2036691653.

The spelling of 40779931 in words is "forty million, seven hundred seventy-nine thousand, nine hundred thirty-one".