40402731 has 8 divisors (see below), whose sum is σ = 54426064. Its totient is φ = 26657280.

The previous prime is 40402729. The next prime is 40402777. The reversal of 40402731 is 13720404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40402731 - 2¹ = 40402729 is a prime.

It is a super-2 number, since 2×40402731² = 3264761344516722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40402698 and 40402707.

It is not an unprimeable number, because it can be changed into a prime (40402031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69130 + ... + 69711.

It is an arithmetic number, because the mean of its divisors is an integer number (6803258).

Almost surely, 2^40402731 is an apocalyptic number.

40402731 is a deficient number, since it is larger than the sum of its proper divisors (14023333).

40402731 is a wasteful number, since it uses less digits than its factorization.

40402731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138941.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40402731 is about 6356.3142622120. The cubic root of 40402731 is about 343.1391259310.

The spelling of 40402731 in words is "forty million, four hundred two thousand, seven hundred thirty-one".