312785649 has 12 divisors (see below), whose sum is σ = 492874512. Its totient is φ = 189567000.

The previous prime is 312785647. The next prime is 312785653. The reversal of 312785649 is 946587213.

312785649 is a `hidden beast` number, since 3 + 12 + 78 + 564 + 9 = 666.

It is not a de Polignac number, because 312785649 - 2¹ = 312785647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312785647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1579627 + ... + 1579824.

It is an arithmetic number, because the mean of its divisors is an integer number (41072876).

Almost surely, 2^312785649 is an apocalyptic number.

It is an amenable number.

312785649 is a deficient number, since it is larger than the sum of its proper divisors (180088863).

312785649 is a wasteful number, since it uses less digits than its factorization.

312785649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159468 (or 3159465 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 312785649 is about 17685.7470580126. The cubic root of 312785649 is about 678.8111066949.

The spelling of 312785649 in words is "three hundred twelve million, seven hundred eighty-five thousand, six hundred forty-nine".