402790655 has 4 divisors (see below), whose sum is σ = 483348792. Its totient is φ = 322232520.

The previous prime is 402790637. The next prime is 402790669. The reversal of 402790655 is 556097204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-402790655 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 40279061 + ... + 40279070.

It is an arithmetic number, because the mean of its divisors is an integer number (120837198).

Almost surely, 2^402790655 is an apocalyptic number.

402790655 is a deficient number, since it is larger than the sum of its proper divisors (80558137).

402790655 is an equidigital number, since it uses as much as digits as its factorization.

402790655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80558136.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 402790655 is about 20069.6451139526. The cubic root of 402790655 is about 738.5158071526.

The spelling of 402790655 in words is "four hundred two million, seven hundred ninety thousand, six hundred fifty-five".