402040657 has 2 divisors, whose sum is σ = 402040658. Its totient is φ = 402040656.

The previous prime is 402040649. The next prime is 402040673. The reversal of 402040657 is 756040204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253956096 + 148084561 = 15936^2 + 12169^2 .

It is a cyclic number.

It is not a de Polignac number, because 402040657 - 2³ = 402040649 is a prime.

It is equal to p_21439225 and since 402040657 and 21439225 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (402040607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201020328 + 201020329.

It is an arithmetic number, because the mean of its divisors is an integer number (201020329).

Almost surely, 2^402040657 is an apocalyptic number.

It is an amenable number.

402040657 is a deficient number, since it is larger than the sum of its proper divisors (1).

402040657 is an equidigital number, since it uses as much as digits as its factorization.

402040657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 402040657 is about 20050.9515235562. The cubic root of 402040657 is about 738.0571491157.

The spelling of 402040657 in words is "four hundred two million, forty thousand, six hundred fifty-seven".