312123987 has 24 divisors (see below), whose sum is σ = 517969920. Its totient is φ = 177415920.

The previous prime is 312123947. The next prime is 312123997. The reversal of 312123987 is 789321213.

It is not a de Polignac number, because 312123987 - 2⁶ = 312123923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312123947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 937 + ... + 25002.

It is an arithmetic number, because the mean of its divisors is an integer number (21582080).

Almost surely, 2^312123987 is an apocalyptic number.

312123987 is a deficient number, since it is larger than the sum of its proper divisors (205845933).

312123987 is a wasteful number, since it uses less digits than its factorization.

312123987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26143 (or 26140 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 312123987 is about 17667.0310748581. The cubic root of 312123987 is about 678.3321198953.

The spelling of 312123987 in words is "three hundred twelve million, one hundred twenty-three thousand, nine hundred eighty-seven".