312640402 has 8 divisors (see below), whose sum is σ = 493642800. Its totient is φ = 148092804.

The previous prime is 312640399. The next prime is 312640429. The reversal of 312640402 is 204046213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4113652 + ... + 4113727.

It is an arithmetic number, because the mean of its divisors is an integer number (61705350).

Almost surely, 2^312640402 is an apocalyptic number.

312640402 is a deficient number, since it is larger than the sum of its proper divisors (181002398).

312640402 is a wasteful number, since it uses less digits than its factorization.

312640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8227400.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 312640402 is about 17681.6402519676. The cubic root of 312640402 is about 678.7060181756.

Adding to 312640402 its reverse (204046213), we get a palindrome (516686615).

The spelling of 312640402 in words is "three hundred twelve million, six hundred forty thousand, four hundred two".