40394992731 has 16 divisors (see below), whose sum is σ = 60029712000. Its totient is φ = 24011883648.

The previous prime is 40394992727. The next prime is 40394992753. The reversal of 40394992731 is 13729949304.

It is not a de Polignac number, because 40394992731 - 2² = 40394992727 is a prime.

It is a super-2 number, since 2×40394992731² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (40394992331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20842681 + ... + 20844618.

It is an arithmetic number, because the mean of its divisors is an integer number (3751857000).

Almost surely, 2^40394992731 is an apocalyptic number.

40394992731 is a deficient number, since it is larger than the sum of its proper divisors (19634719269).

40394992731 is a wasteful number, since it uses less digits than its factorization.

40394992731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41687338.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 40394992731 in words is "forty billion, three hundred ninety-four million, nine hundred ninety-two thousand, seven hundred thirty-one".