312346640 has 20 divisors (see below), whose sum is σ = 726206124. Its totient is φ = 124938624.

The previous prime is 312346621. The next prime is 312346667. The reversal of 312346640 is 46643213.

It can be written as a sum of positive squares in 2 ways, for example, as 48219136 + 264127504 = 6944^2 + 16252^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1952087 + ... + 1952246.

Almost surely, 2^312346640 is an apocalyptic number.

It is an amenable number.

312346640 is an abundant number, since it is smaller than the sum of its proper divisors (413859484).

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

312346640 is a wasteful number, since it uses less digits than its factorization.

312346640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904346 (or 3904340 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 312346640 is about 17673.3313215138. The cubic root of 312346640 is about 678.4933771617.

Adding to 312346640 its reverse (46643213), we get a palindrome (358989853).

The spelling of 312346640 in words is "three hundred twelve million, three hundred forty-six thousand, six hundred forty".