40386731 has 12 divisors (see below), whose sum is σ = 51252120. Its totient is φ = 31469760.

The previous prime is 40386701. The next prime is 40386737. The reversal of 40386731 is 13768304.

It is not a de Polignac number, because 40386731 - 2⁶ = 40386667 is a prime.

It is a super-2 number, since 2×40386731² = 3262176081732722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40386737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36926 + ... + 38003.

It is an arithmetic number, because the mean of its divisors is an integer number (4271010).

Almost surely, 2^40386731 is an apocalyptic number.

40386731 is a deficient number, since it is larger than the sum of its proper divisors (10865389).

40386731 is a wasteful number, since it uses less digits than its factorization.

40386731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74954 (or 74947 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 40386731 is about 6355.0555465708. The cubic root of 40386731 is about 343.0938241179.

The spelling of 40386731 in words is "forty million, three hundred eighty-six thousand, seven hundred thirty-one".