402224257 has 2 divisors, whose sum is σ = 402224258. Its totient is φ = 402224256.

The previous prime is 402224239. The next prime is 402224297. The reversal of 402224257 is 752422204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380406016 + 21818241 = 19504^2 + 4671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402224257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402224297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201112128 + 201112129.

It is an arithmetic number, because the mean of its divisors is an integer number (201112129).

Almost surely, 2^402224257 is an apocalyptic number.

It is an amenable number.

402224257 is a deficient number, since it is larger than the sum of its proper divisors (1).

402224257 is an equidigital number, since it uses as much as digits as its factorization.

402224257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 402224257 is about 20055.5293373174. The cubic root of 402224257 is about 738.1694815942.

The spelling of 402224257 in words is "four hundred two million, two hundred twenty-four thousand, two hundred fifty-seven".