40731913 has 4 divisors (see below), whose sum is σ = 41339920. Its totient is φ = 40123908.

The previous prime is 40731893. The next prime is 40731937. The reversal of 40731913 is 31913704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40731913 - 2²⁵ = 7177481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40731113) 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 3 ways as a sum of consecutive naturals, for example, 303903 + ... + 304036.

It is an arithmetic number, because the mean of its divisors is an integer number (10334980).

Almost surely, 2^40731913 is an apocalyptic number.

It is an amenable number.

40731913 is a deficient number, since it is larger than the sum of its proper divisors (608007).

40731913 is an equidigital number, since it uses as much as digits as its factorization.

40731913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608006.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 40731913 is about 6382.1558269914. The cubic root of 40731913 is about 344.0685172020.

The spelling of 40731913 in words is "forty million, seven hundred thirty-one thousand, nine hundred thirteen".