1318198920 has 32 divisors (see below), whose sum is σ = 3954597120. Its totient is φ = 351519680.

The previous prime is 1318198919. The next prime is 1318198933. The reversal of 1318198920 is 298918131.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5492376 + ... + 5492615.

It is an arithmetic number, because the mean of its divisors is an integer number (123581160).

Almost surely, 2^1318198920 is an apocalyptic number.

1318198920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1318198920 is an abundant number, since it is smaller than the sum of its proper divisors (2636398200).

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

1318198920 is a wasteful number, since it uses less digits than its factorization.

1318198920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10985005 (or 10985001 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 1318198920 is about 36307.0092406411. The cubic root of 1318198920 is about 1096.4621654486.

It can be divided in two parts, 13181 and 98920, that added together give a triangular number (112101 = T₄₇₃).

The spelling of 1318198920 in words is "one billion, three hundred eighteen million, one hundred ninety-eight thousand, nine hundred twenty".