1989634144 has 24 divisors (see below), whose sum is σ = 3975560568. Its totient is φ = 979968000.

The previous prime is 1989634109. The next prime is 1989634169. The reversal of 1989634144 is 4414369891.

It is a super-2 number, since 2×1989634144² = 7917288053941225472, 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 3 ways as a sum of consecutive naturals, for example, 461857 + ... + 466144.

It is an arithmetic number, because the mean of its divisors is an integer number (165648357).

Almost surely, 2^1989634144 is an apocalyptic number.

It is an amenable number.

1989634144 is a deficient number, since it is larger than the sum of its proper divisors (1985926424).

1989634144 is an equidigital number, since it uses as much as digits as its factorization.

1989634144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928078 (or 928070 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The square root of 1989634144 is about 44605.3151989760. The cubic root of 1989634144 is about 1257.7405851184.

The spelling of 1989634144 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-four thousand, one hundred forty-four".