40257631 has 2 divisors, whose sum is σ = 40257632. Its totient is φ = 40257630.

The previous prime is 40257601. The next prime is 40257641. The reversal of 40257631 is 13675204.

40257631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40257631 - 2¹¹ = 40255583 is a prime.

It is a super-2 number, since 2×40257631² = 3241353707464322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40257631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40257601) 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 as a sum of consecutive naturals, namely, 20128815 + 20128816.

It is an arithmetic number, because the mean of its divisors is an integer number (20128816).

Almost surely, 2^40257631 is an apocalyptic number.

40257631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40257631 is an equidigital number, since it uses as much as digits as its factorization.

40257631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 40257631 is about 6344.8901487733. The cubic root of 40257631 is about 342.7278566197.

The spelling of 40257631 in words is "forty million, two hundred fifty-seven thousand, six hundred thirty-one".