402869690 has 32 divisors (see below), whose sum is σ = 762958224. Its totient is φ = 152962560.

The previous prime is 402869629. The next prime is 402869737. The reversal of 402869690 is 96968204.

It can be written as a sum of positive squares in 8 ways, for example, as 142014889 + 260854801 = 11917^2 + 16151^2 .

It is a super-2 number, since 2×402869690² = 324607974241392200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1892 + ... + 28448.

Almost surely, 2^402869690 is an apocalyptic number.

402869690 is a deficient number, since it is larger than the sum of its proper divisors (360088534).

402869690 is a wasteful number, since it uses less digits than its factorization.

402869690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26642.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 402869690 is about 20071.6140357471. The cubic root of 402869690 is about 738.5641074950.

The spelling of 402869690 in words is "four hundred two million, eight hundred sixty-nine thousand, six hundred ninety".