312311640 has 32 divisors (see below), whose sum is σ = 936935280. Its totient is φ = 83283072.

The previous prime is 312311633. The next prime is 312311647. The reversal of 312311640 is 46113213.

It is an interprime number because it is at equal distance from previous prime (312311633) and next prime (312311647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312311647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301179 + ... + 1301418.

Almost surely, 2^312311640 is an apocalyptic number.

312311640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312311640 is an abundant number, since it is smaller than the sum of its proper divisors (624623640).

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

312311640 is a wasteful number, since it uses less digits than its factorization.

312311640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602611 (or 2602607 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 312311640 is about 17672.3411012803. The cubic root of 312311640 is about 678.4680333585.

Adding to 312311640 its reverse (46113213), we get a palindrome (358424853).

The spelling of 312311640 in words is "three hundred twelve million, three hundred eleven thousand, six hundred forty".