402352981 has 2 divisors, whose sum is σ = 402352982. Its totient is φ = 402352980.

The previous prime is 402352943. The next prime is 402353009. The reversal of 402352981 is 189253204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323676081 + 78676900 = 17991^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 402352981 - 2¹⁵ = 402320213 is a prime.

It is a super-2 number, since 2×402352981² = 323775842639172722, which contains 22 as substring.

It is equal to p_21454963 and since 402352981 and 21454963 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402352901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201176490 + 201176491.

It is an arithmetic number, because the mean of its divisors is an integer number (201176491).

Almost surely, 2^402352981 is an apocalyptic number.

It is an amenable number.

402352981 is a deficient number, since it is larger than the sum of its proper divisors (1).

402352981 is an equidigital number, since it uses as much as digits as its factorization.

402352981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 402352981 is about 20058.7382703898. The cubic root of 402352981 is about 738.2482187597.

The spelling of 402352981 in words is "four hundred two million, three hundred fifty-two thousand, nine hundred eighty-one".