389987321892 has 48 divisors (see below), whose sum is σ = 1040072033280. Its totient is φ = 111413608992.

The previous prime is 389987321887. The next prime is 389987322061. The reversal of 389987321892 is 298123789983.

It is a super-2 number, since 2×389987321892² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612043 + ... + 1074509.

It is an arithmetic number, because the mean of its divisors is an integer number (21668167360).

Almost surely, 2^389987321892 is an apocalyptic number.

It is an amenable number.

389987321892 is an abundant number, since it is smaller than the sum of its proper divisors (650084711388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389987321892 is a wasteful number, since it uses less digits than its factorization.

389987321892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472520 (or 472518 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 69.

The spelling of 389987321892 in words is "three hundred eighty-nine billion, nine hundred eighty-seven million, three hundred twenty-one thousand, eight hundred ninety-two".