1312695820 has 24 divisors (see below), whose sum is σ = 2758384944. Its totient is φ = 524750016.

The previous prime is 1312695781. The next prime is 1312695821. The reversal of 1312695820 is 285962131.

It is a self number, because there is not a number n which added to its sum of digits gives 1312695820.

It is not an unprimeable number, because it can be changed into a prime (1312695821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13654 + ... + 53026.

It is an arithmetic number, because the mean of its divisors is an integer number (114932706).

Almost surely, 2^1312695820 is an apocalyptic number.

1312695820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312695820 is an abundant number, since it is smaller than the sum of its proper divisors (1445689124).

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

1312695820 is a wasteful number, since it uses less digits than its factorization.

1312695820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41049 (or 41047 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1312695820 is about 36231.1443374343. The cubic root of 1312695820 is about 1094.9342328952.

The spelling of 1312695820 in words is "one billion, three hundred twelve million, six hundred ninety-five thousand, eight hundred twenty".