1981339924 has 24 divisors (see below), whose sum is σ = 3554022528. Its totient is φ = 965933760.

The previous prime is 1981339907. The next prime is 1981339951. The reversal of 1981339924 is 4299331891.

It is a super-3 number, since 3×1981339924³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

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, 441717 + ... + 446179.

It is an arithmetic number, because the mean of its divisors is an integer number (148084272).

Almost surely, 2^1981339924 is an apocalyptic number.

It is an amenable number.

1981339924 is a deficient number, since it is larger than the sum of its proper divisors (1572682604).

1981339924 is a wasteful number, since it uses less digits than its factorization.

1981339924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215 (or 7213 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The square root of 1981339924 is about 44512.2446524549. The cubic root of 1981339924 is about 1255.9904297282.

The spelling of 1981339924 in words is "one billion, nine hundred eighty-one million, three hundred thirty-nine thousand, nine hundred twenty-four".