1318721992 has 32 divisors (see below), whose sum is σ = 2827627200. Its totient is φ = 564807744.

The previous prime is 1318721981. The next prime is 1318721993. The reversal of 1318721992 is 2991278131.

It is not an unprimeable number, because it can be changed into a prime (1318721993) 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, 93603 + ... + 106765.

It is an arithmetic number, because the mean of its divisors is an integer number (88363350).

Almost surely, 2^1318721992 is an apocalyptic number.

It is an amenable number.

1318721992 is an abundant number, since it is smaller than the sum of its proper divisors (1508905208).

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

1318721992 is a wasteful number, since it uses less digits than its factorization.

1318721992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14965 (or 14961 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 1318721992 is about 36314.2119837399. The cubic root of 1318721992 is about 1096.6071746238.

The spelling of 1318721992 in words is "one billion, three hundred eighteen million, seven hundred twenty-one thousand, nine hundred ninety-two".