40457731 has 2 divisors, whose sum is σ = 40457732. Its totient is φ = 40457730.

The previous prime is 40457719. The next prime is 40457737. The reversal of 40457731 is 13775404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40457731 - 2⁵ = 40457699 is a prime.

It is a super-2 number, since 2×40457731² = 3273655995336722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40457693 and 40457702.

It is not a weakly prime, because it can be changed into another prime (40457737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20228865 + 20228866.

It is an arithmetic number, because the mean of its divisors is an integer number (20228866).

Almost surely, 2^40457731 is an apocalyptic number.

40457731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40457731 is an equidigital number, since it uses as much as digits as its factorization.

40457731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 40457731 is about 6360.6391974392. The cubic root of 40457731 is about 343.2947597556.

The spelling of 40457731 in words is "forty million, four hundred fifty-seven thousand, seven hundred thirty-one".