1312639188 has 48 divisors (see below), whose sum is σ = 3531373440. Its totient is φ = 371718144.

The previous prime is 1312639147. The next prime is 1312639189. The reversal of 1312639188 is 8819362131.

It is a super-3 number, since 3×1312639188³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312639189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59653 + ... + 78636.

It is an arithmetic number, because the mean of its divisors is an integer number (73570280).

Almost surely, 2^1312639188 is an apocalyptic number.

It is an amenable number.

1312639188 is an abundant number, since it is smaller than the sum of its proper divisors (2218734252).

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

1312639188 is a wasteful number, since it uses less digits than its factorization.

1312639188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138416 (or 138414 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 1312639188 is about 36230.3627914488. The cubic root of 1312639188 is about 1094.9184868744.

The spelling of 1312639188 in words is "one billion, three hundred twelve million, six hundred thirty-nine thousand, one hundred eighty-eight".