40840731 has 12 divisors (see below), whose sum is σ = 59704008. Its totient is φ = 26898624.

The previous prime is 40840727. The next prime is 40840741. The reversal of 40840731 is 13704804.

It is not a de Polignac number, because 40840731 - 2² = 40840727 is a prime.

It is a super-2 number, since 2×40840731² = 3335930617228722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40840695 and 40840704.

It is not an unprimeable number, because it can be changed into a prime (40840741) 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, 26590 + ... + 28083.

It is an arithmetic number, because the mean of its divisors is an integer number (4975334).

Almost surely, 2^40840731 is an apocalyptic number.

40840731 is a deficient number, since it is larger than the sum of its proper divisors (18863277).

40840731 is a wasteful number, since it uses less digits than its factorization.

40840731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54762 (or 54759 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 40840731 is about 6390.6753164278. The cubic root of 40840731 is about 344.3746453510.

The spelling of 40840731 in words is "forty million, eight hundred forty thousand, seven hundred thirty-one".