1312861900 has 108 divisors (see below), whose sum is σ = 3428686800. Its totient is φ = 434555520.

The previous prime is 1312861897. The next prime is 1312861909. The reversal of 1312861900 is 91682131.

It is a super-2 number, since 2×1312861900² = 3447212736943220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1312861909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 137481 + ... + 146719.

It is an arithmetic number, because the mean of its divisors is an integer number (31747100).

Almost surely, 2^1312861900 is an apocalyptic number.

1312861900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312861900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1714343400).

1312861900 is an abundant number, since it is smaller than the sum of its proper divisors (2115824900).

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

1312861900 is a wasteful number, since it uses less digits than its factorization.

1312861900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9296 (or 9282 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1312861900 is about 36233.4362157386. The cubic root of 1312861900 is about 1094.9804073418.

The spelling of 1312861900 in words is "one billion, three hundred twelve million, eight hundred sixty-one thousand, nine hundred".