312320442 has 32 divisors (see below), whose sum is σ = 751449600. Its totient is φ = 84537648.

The previous prime is 312320431. The next prime is 312320471. The reversal of 312320442 is 244023213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194892 + ... + 196487.

It is an arithmetic number, because the mean of its divisors is an integer number (23482800).

Almost surely, 2^312320442 is an apocalyptic number.

312320442 is an abundant number, since it is smaller than the sum of its proper divisors (439129158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312320442 is a wasteful number, since it uses less digits than its factorization.

312320442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391410.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 312320442 is about 17672.5901327451. The cubic root of 312320442 is about 678.4744071412.

Adding to 312320442 its reverse (244023213), we get a palindrome (556343655).

The spelling of 312320442 in words is "three hundred twelve million, three hundred twenty thousand, four hundred forty-two".