1231398160 has 20 divisors (see below), whose sum is σ = 2863000908. Its totient is φ = 492559232.

The previous prime is 1231398149. The next prime is 1231398163. The reversal of 1231398160 is 618931321.

It can be written as a sum of positive squares in 2 ways, for example, as 517653504 + 713744656 = 22752^2 + 26716^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1231398163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7696159 + ... + 7696318.

Almost surely, 2^1231398160 is an apocalyptic number.

1231398160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231398160 is an abundant number, since it is smaller than the sum of its proper divisors (1631602748).

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

1231398160 is a wasteful number, since it uses less digits than its factorization.

1231398160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15392490 (or 15392484 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1231398160 is about 35091.2832481230. The cubic root of 1231398160 is about 1071.8470905760.

The spelling of 1231398160 in words is "one billion, two hundred thirty-one million, three hundred ninety-eight thousand, one hundred sixty".