1981954924 has 24 divisors (see below), whose sum is σ = 3555469008. Its totient is φ = 966140160.

The previous prime is 1981954903. The next prime is 1981954967. The reversal of 1981954924 is 4294591891.

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, 302952 + ... + 309424.

It is an arithmetic number, because the mean of its divisors is an integer number (148144542).

Almost surely, 2^1981954924 is an apocalyptic number.

It is an amenable number.

1981954924 is a deficient number, since it is larger than the sum of its proper divisors (1573514084).

1981954924 is a wasteful number, since it uses less digits than its factorization.

1981954924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385 (or 8383 counting only the distinct ones).

The product of its digits is 933120, while the sum is 52.

The square root of 1981954924 is about 44519.1523279588. The cubic root of 1981954924 is about 1256.1203677562.

The spelling of 1981954924 in words is "one billion, nine hundred eighty-one million, nine hundred fifty-four thousand, nine hundred twenty-four".