1981719592 has 16 divisors (see below), whose sum is σ = 3721476960. Its totient is φ = 989325744.

The previous prime is 1981719577. The next prime is 1981719613. The reversal of 1981719592 is 2959171891.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186258 + ... + 196609.

It is an arithmetic number, because the mean of its divisors is an integer number (232592310).

Almost surely, 2^1981719592 is an apocalyptic number.

It is an amenable number.

1981719592 is a deficient number, since it is larger than the sum of its proper divisors (1739757368).

1981719592 is a wasteful number, since it uses less digits than its factorization.

1981719592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383520 (or 383516 counting only the distinct ones).

The product of its digits is 408240, while the sum is 52.

The square root of 1981719592 is about 44516.5092072593. The cubic root of 1981719592 is about 1256.0706496697.

The spelling of 1981719592 in words is "one billion, nine hundred eighty-one million, seven hundred nineteen thousand, five hundred ninety-two".