1981918088 has 32 divisors (see below), whose sum is σ = 3794364000. Its totient is φ = 970224000.

The previous prime is 1981918067. The next prime is 1981918129. The reversal of 1981918088 is 8808191891.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110108 + ... + 126836.

It is an arithmetic number, because the mean of its divisors is an integer number (118573875).

Almost surely, 2^1981918088 is an apocalyptic number.

It is an amenable number.

1981918088 is a deficient number, since it is larger than the sum of its proper divisors (1812445912).

1981918088 is a wasteful number, since it uses less digits than its factorization.

1981918088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17045 (or 17041 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 53.

The square root of 1981918088 is about 44518.7386164523. The cubic root of 1981918088 is about 1256.1125857534.

The spelling of 1981918088 in words is "one billion, nine hundred eighty-one million, nine hundred eighteen thousand, eighty-eight".