1989876956 has 18 divisors (see below), whose sum is σ = 3532665528. Its totient is φ = 980554680.

The previous prime is 1989876923. The next prime is 1989877007. The reversal of 1989876956 is 6596789891.

It is a super-2 number, since 2×1989876956² = 7919220600039651872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 750425 + ... + 753071.

It is an arithmetic number, because the mean of its divisors is an integer number (196259196).

Almost surely, 2^1989876956 is an apocalyptic number.

It is an amenable number.

1989876956 is a deficient number, since it is larger than the sum of its proper divisors (1542788572).

1989876956 is an frugal number, since it uses more digits than its factorization.

1989876956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369 (or 2720 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 68.

The square root of 1989876956 is about 44608.0368991956. The cubic root of 1989876956 is about 1257.7917473024.

The spelling of 1989876956 in words is "one billion, nine hundred eighty-nine million, eight hundred seventy-six thousand, nine hundred fifty-six".