40238657 has 2 divisors, whose sum is σ = 40238658. Its totient is φ = 40238656.

The previous prime is 40238641. The next prime is 40238683. The reversal of 40238657 is 75683204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21307456 + 18931201 = 4616^2 + 4351^2 .

It is a cyclic number.

It is not a de Polignac number, because 40238657 - 2⁴ = 40238641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40238617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20119328 + 20119329.

It is an arithmetic number, because the mean of its divisors is an integer number (20119329).

Almost surely, 2^40238657 is an apocalyptic number.

It is an amenable number.

40238657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40238657 is an equidigital number, since it uses as much as digits as its factorization.

40238657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 40238657 is about 6343.3947536000. The cubic root of 40238657 is about 342.6740039703.

The spelling of 40238657 in words is "forty million, two hundred thirty-eight thousand, six hundred fifty-seven".