1989678933 has 12 divisors (see below), whose sum is σ = 3135251808. Its totient is φ = 1205865960.

The previous prime is 1989678919. The next prime is 1989678941. The reversal of 1989678933 is 3398769891.

It is not a de Polignac number, because 1989678933 - 2⁹ = 1989678421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989678953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10048785 + ... + 10048982.

It is an arithmetic number, because the mean of its divisors is an integer number (261270984).

Almost surely, 2^1989678933 is an apocalyptic number.

It is an amenable number.

1989678933 is a deficient number, since it is larger than the sum of its proper divisors (1145572875).

1989678933 is a wasteful number, since it uses less digits than its factorization.

1989678933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20097784 (or 20097781 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 1989678933 is about 44605.8172551518. The cubic root of 1989678933 is about 1257.7500227866.

The spelling of 1989678933 in words is "one billion, nine hundred eighty-nine million, six hundred seventy-eight thousand, nine hundred thirty-three".