402938257 has 2 divisors, whose sum is σ = 402938258. Its totient is φ = 402938256.

The previous prime is 402938243. The next prime is 402938269. The reversal of 402938257 is 752839204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310605376 + 92332881 = 17624^2 + 9609^2 .

It is a cyclic number.

It is not a de Polignac number, because 402938257 - 2¹⁹ = 402413969 is a prime.

It is not a weakly prime, because it can be changed into another prime (402938227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201469128 + 201469129.

It is an arithmetic number, because the mean of its divisors is an integer number (201469129).

Almost surely, 2^402938257 is an apocalyptic number.

It is an amenable number.

402938257 is a deficient number, since it is larger than the sum of its proper divisors (1).

402938257 is an equidigital number, since it uses as much as digits as its factorization.

402938257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 402938257 is about 20073.3220220271. The cubic root of 402938257 is about 738.6060054533.

The spelling of 402938257 in words is "four hundred two million, nine hundred thirty-eight thousand, two hundred fifty-seven".