40113731 has 16 divisors (see below), whose sum is σ = 48533760. Its totient is φ = 32387040.

The previous prime is 40113709. The next prime is 40113743. The reversal of 40113731 is 13731104.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-40113731 is a prime.

It is a super-2 number, since 2×40113731² = 3218222829480722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40113791) 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, 25436 + ... + 26966.

It is an arithmetic number, because the mean of its divisors is an integer number (3033360).

Almost surely, 2^40113731 is an apocalyptic number.

40113731 is a deficient number, since it is larger than the sum of its proper divisors (8420029).

40113731 is a wasteful number, since it uses less digits than its factorization.

40113731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 40113731 is about 6333.5401632894. The cubic root of 40113731 is about 342.3190114146.

Adding to 40113731 its reverse (13731104), we get a palindrome (53844835).

The spelling of 40113731 in words is "forty million, one hundred thirteen thousand, seven hundred thirty-one".