402240257 has 2 divisors, whose sum is σ = 402240258. Its totient is φ = 402240256.

The previous prime is 402240239. The next prime is 402240269. The reversal of 402240257 is 752042204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390102001 + 12138256 = 19751^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 402240257 - 2¹⁸ = 401978113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402240557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201120128 + 201120129.

It is an arithmetic number, because the mean of its divisors is an integer number (201120129).

Almost surely, 2^402240257 is an apocalyptic number.

It is an amenable number.

402240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

402240257 is an equidigital number, since it uses as much as digits as its factorization.

402240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 402240257 is about 20055.9282258389. The cubic root of 402240257 is about 738.1792692975.

The spelling of 402240257 in words is "four hundred two million, two hundred forty thousand, two hundred fifty-seven".