312821340 has 48 divisors (see below), whose sum is σ = 943279008. Its totient is φ = 77001984.

The previous prime is 312821329. The next prime is 312821381. The reversal of 312821340 is 43128213.

It is a self number, because there is not a number n which added to its sum of digits gives 312821340.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 199747 + ... + 201306.

It is an arithmetic number, because the mean of its divisors is an integer number (19651646).

Almost surely, 2^312821340 is an apocalyptic number.

312821340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312821340 is an abundant number, since it is smaller than the sum of its proper divisors (630457668).

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

312821340 is a wasteful number, since it uses less digits than its factorization.

312821340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401078 (or 401076 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 312821340 is about 17686.7560620935. The cubic root of 312821340 is about 678.8369247227.

Adding to 312821340 its reverse (43128213), we get a palindrome (355949553).

The spelling of 312821340 in words is "three hundred twelve million, eight hundred twenty-one thousand, three hundred forty".