402790669 has 2 divisors, whose sum is σ = 402790670. Its totient is φ = 402790668.

The previous prime is 402790637. The next prime is 402790681. The reversal of 402790669 is 966097204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324468169 + 78322500 = 18013^2 + 8850^2 .

It is a cyclic number.

It is not a de Polignac number, because 402790669 - 2⁵ = 402790637 is a prime.

It is a super-2 number, since 2×402790669² = 324480646066935122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402794669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201395334 + 201395335.

It is an arithmetic number, because the mean of its divisors is an integer number (201395335).

Almost surely, 2^402790669 is an apocalyptic number.

It is an amenable number.

402790669 is a deficient number, since it is larger than the sum of its proper divisors (1).

402790669 is an equidigital number, since it uses as much as digits as its factorization.

402790669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 402790669 is about 20069.6454627380. The cubic root of 402790669 is about 738.5158157090.

The spelling of 402790669 in words is "four hundred two million, seven hundred ninety thousand, six hundred sixty-nine".