40637731 has 2 divisors, whose sum is σ = 40637732. Its totient is φ = 40637730.

The previous prime is 40637717. The next prime is 40637747. The reversal of 40637731 is 13773604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40637731 - 2⁵ = 40637699 is a prime.

It is a super-2 number, since 2×40637731² = 3302850361656722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40637693 and 40637702.

It is not a weakly prime, because it can be changed into another prime (40637761) 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, 20318865 + 20318866.

It is an arithmetic number, because the mean of its divisors is an integer number (20318866).

Almost surely, 2^40637731 is an apocalyptic number.

40637731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40637731 is an equidigital number, since it uses as much as digits as its factorization.

40637731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 40637731 is about 6374.7730155669. The cubic root of 40637731 is about 343.8031227652.

The spelling of 40637731 in words is "forty million, six hundred thirty-seven thousand, seven hundred thirty-one".