312661940 has 12 divisors (see below), whose sum is σ = 656590116. Its totient is φ = 125064768.

The previous prime is 312661933. The next prime is 312661949. The reversal of 312661940 is 49166213.

It can be written as a sum of positive squares in 2 ways, for example, as 52678564 + 259983376 = 7258^2 + 16124^2 .

It is a junction number, because it is equal to n+sod(n) for n = 312661897 and 312661906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312661949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816529 + ... + 7816568.

It is an arithmetic number, because the mean of its divisors is an integer number (54715843).

Almost surely, 2^312661940 is an apocalyptic number.

It is an amenable number.

312661940 is an abundant number, since it is smaller than the sum of its proper divisors (343928176).

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

312661940 is a wasteful number, since it uses less digits than its factorization.

312661940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15633106 (or 15633104 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 312661940 is about 17682.2492913091. The cubic root of 312661940 is about 678.7216033169.

The spelling of 312661940 in words is "three hundred twelve million, six hundred sixty-one thousand, nine hundred forty".