402939281 has 2 divisors, whose sum is σ = 402939282. Its totient is φ = 402939280.

The previous prime is 402939247. The next prime is 402939367. The reversal of 402939281 is 182939204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271722256 + 131217025 = 16484^2 + 11455^2 .

It is a cyclic number.

It is not a de Polignac number, because 402939281 - 2¹⁰ = 402938257 is a prime.

It is a super-2 number, since 2×402939281² = 324720128345593922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402939241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201469640 + 201469641.

It is an arithmetic number, because the mean of its divisors is an integer number (201469641).

Almost surely, 2^402939281 is an apocalyptic number.

It is an amenable number.

402939281 is a deficient number, since it is larger than the sum of its proper divisors (1).

402939281 is an equidigital number, since it uses as much as digits as its factorization.

402939281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 402939281 is about 20073.3475285016. The cubic root of 402939281 is about 738.6066311339.

The spelling of 402939281 in words is "four hundred two million, nine hundred thirty-nine thousand, two hundred eighty-one".