1312012620 has 48 divisors (see below), whose sum is σ = 4081818720. Its totient is φ = 349869888.

The previous prime is 1312012619. The next prime is 1312012631. The reversal of 1312012620 is 262102131.

1312012620 is a `hidden beast` number, since 1 + 31 + 2 + 0 + 12 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1312012593 and 1312012602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1214287 + ... + 1215366.

It is an arithmetic number, because the mean of its divisors is an integer number (85037890).

Almost surely, 2^1312012620 is an apocalyptic number.

1312012620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312012620 is an abundant number, since it is smaller than the sum of its proper divisors (2769806100).

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

1312012620 is a wasteful number, since it uses less digits than its factorization.

1312012620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429671 (or 2429663 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1312012620 is about 36221.7147578631. The cubic root of 1312012620 is about 1094.7442450165.

Adding to 1312012620 its reverse (262102131), we get a palindrome (1574114751).

The spelling of 1312012620 in words is "one billion, three hundred twelve million, twelve thousand, six hundred twenty".