1312689240 has 160 divisors (see below), whose sum is σ = 4427874000. Its totient is φ = 348800256.

The previous prime is 1312689211. The next prime is 1312689241. The reversal of 1312689240 is 429862131.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1312689195 and 1312689204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312689241) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1227426 + ... + 1228494.

Almost surely, 2^1312689240 is an apocalyptic number.

1312689240 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 1312689240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213937000).

1312689240 is an abundant number, since it is smaller than the sum of its proper divisors (3115184760).

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

1312689240 is a wasteful number, since it uses less digits than its factorization.

1312689240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1312689240 is about 36231.0535314666. The cubic root of 1312689240 is about 1094.9324034084.

The spelling of 1312689240 in words is "one billion, three hundred twelve million, six hundred eighty-nine thousand, two hundred forty".