312399989 has 8 divisors (see below), whose sum is σ = 351793920. Its totient is φ = 274838400.

The previous prime is 312399937. The next prime is 312400001. The reversal of 312399989 is 989993213.

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

It is a cyclic number.

It is not a de Polignac number, because 312399989 - 2¹⁶ = 312334453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 312399989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312399289) 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, 457724 + ... + 458405.

It is an arithmetic number, because the mean of its divisors is an integer number (43974240).

Almost surely, 2^312399989 is an apocalyptic number.

It is an amenable number.

312399989 is a deficient number, since it is larger than the sum of its proper divisors (39393931).

312399989 is a wasteful number, since it uses less digits than its factorization.

312399989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916171.

The product of its digits is 944784, while the sum is 53.

The square root of 312399989 is about 17674.8405650518. The cubic root of 312399989 is about 678.5320039926.

The spelling of 312399989 in words is "three hundred twelve million, three hundred ninety-nine thousand, nine hundred eighty-nine".