1312986840 has 128 divisors (see below), whose sum is σ = 4549893120. Its totient is φ = 299571200.

The previous prime is 1312986797. The next prime is 1312986853. The reversal of 1312986840 is 486892131.

It is a junction number, because it is equal to n+sod(n) for n = 1312986792 and 1312986801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6816 + ... + 51695.

It is an arithmetic number, because the mean of its divisors is an integer number (35546040).

Almost surely, 2^1312986840 is an apocalyptic number.

1312986840 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 1312986840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2274946560).

1312986840 is an abundant number, since it is smaller than the sum of its proper divisors (3236906280).

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

1312986840 is a wasteful number, since it uses less digits than its factorization.

1312986840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58553 (or 58549 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1312986840 is about 36235.1602728620. The cubic root of 1312986840 is about 1095.0151412597.

The spelling of 1312986840 in words is "one billion, three hundred twelve million, nine hundred eighty-six thousand, eight hundred forty".