312689990 has 16 divisors (see below), whose sum is σ = 563226048. Its totient is φ = 124990656.

The previous prime is 312689987. The next prime is 312689999. The reversal of 312689990 is 99986213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312689999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5954 + ... + 25706.

It is an arithmetic number, because the mean of its divisors is an integer number (35201628).

Almost surely, 2^312689990 is an apocalyptic number.

312689990 is a deficient number, since it is larger than the sum of its proper divisors (250536058).

312689990 is a wasteful number, since it uses less digits than its factorization.

312689990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21343.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 312689990 is about 17683.0424418424. The cubic root of 312689990 is about 678.7418995424.

The spelling of 312689990 in words is "three hundred twelve million, six hundred eighty-nine thousand, nine hundred ninety".