1312275840 has 64 divisors (see below), whose sum is σ = 4182885360. Its totient is φ = 349939712.

The previous prime is 1312275829. The next prime is 1312275851. The reversal of 1312275840 is 485722131.

It is an interprime number because it is at equal distance from previous prime (1312275829) and next prime (1312275851).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339819 + ... + 343658.

Almost surely, 2^1312275840 is an apocalyptic number.

1312275840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312275840 is an abundant number, since it is smaller than the sum of its proper divisors (2870609520).

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

1312275840 is an equidigital number, since it uses as much as digits as its factorization.

1312275840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683499 (or 683487 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1312275840 is about 36225.3480314544. The cubic root of 1312275840 is about 1094.8174504384.

Adding to 1312275840 its reverse (485722131), we get a palindrome (1797997971).

The spelling of 1312275840 in words is "one billion, three hundred twelve million, two hundred seventy-five thousand, eight hundred forty".