1312787400 has 48 divisors (see below), whose sum is σ = 4069642800. Its totient is φ = 350076480.

The previous prime is 1312787383. The next prime is 1312787407. The reversal of 1312787400 is 47872131.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1312787407) 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 11 ways as a sum of consecutive naturals, for example, 1093390 + ... + 1094589.

It is an arithmetic number, because the mean of its divisors is an integer number (84784225).

Almost surely, 2^1312787400 is an apocalyptic number.

1312787400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312787400 is an abundant number, since it is smaller than the sum of its proper divisors (2756855400).

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

1312787400 is a wasteful number, since it uses less digits than its factorization.

1312787400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187998 (or 2187989 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 1312787400 is about 36232.4081451951. The cubic root of 1312787400 is about 1094.9596949365.

The spelling of 1312787400 in words is "one billion, three hundred twelve million, seven hundred eighty-seven thousand, four hundred".