40057731 has 12 divisors (see below), whose sum is σ = 66127152. Its totient is φ = 22890096.

The previous prime is 40057727. The next prime is 40057741. The reversal of 40057731 is 13775004.

40057731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40057731 - 2² = 40057727 is a prime.

It is a super-2 number, since 2×40057731² = 3209243625736722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40057695 and 40057704.

It is not an unprimeable number, because it can be changed into a prime (40057741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317856 + ... + 317981.

It is an arithmetic number, because the mean of its divisors is an integer number (5510596).

Almost surely, 2^40057731 is an apocalyptic number.

40057731 is a deficient number, since it is larger than the sum of its proper divisors (26069421).

40057731 is a wasteful number, since it uses less digits than its factorization.

40057731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635850 (or 635847 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 40057731 is about 6329.1177110242. The cubic root of 40057731 is about 342.1596412799.

The spelling of 40057731 in words is "forty million, fifty-seven thousand, seven hundred thirty-one".