312221990 has 16 divisors (see below), whose sum is σ = 563153040. Its totient is φ = 124632480.

The previous prime is 312221989. The next prime is 312221999. The reversal of 312221990 is 99122213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312221999) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 26885 + ... + 36704.

It is an arithmetic number, because the mean of its divisors is an integer number (35197065).

Almost surely, 2^312221990 is an apocalyptic number.

312221990 is a deficient number, since it is larger than the sum of its proper divisors (250931050).

312221990 is a wasteful number, since it uses less digits than its factorization.

312221990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64087.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 312221990 is about 17669.8044697727. The cubic root of 312221990 is about 678.4031083794.

The spelling of 312221990 in words is "three hundred twelve million, two hundred twenty-one thousand, nine hundred ninety".