40013657 has 2 divisors, whose sum is σ = 40013658. Its totient is φ = 40013656.

The previous prime is 40013647. The next prime is 40013669. The reversal of 40013657 is 75631004.

40013657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 121801 = 6316^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 40013657 - 2⁶ = 40013593 is a prime.

It is not a weakly prime, because it can be changed into another prime (40013627) 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, 20006828 + 20006829.

It is an arithmetic number, because the mean of its divisors is an integer number (20006829).

Almost surely, 2^40013657 is an apocalyptic number.

It is an amenable number.

40013657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013657 is an equidigital number, since it uses as much as digits as its factorization.

40013657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 40013657 is about 6325.6349088451. The cubic root of 40013657 is about 342.0341068090.

The spelling of 40013657 in words is "forty million, thirteen thousand, six hundred fifty-seven".