389969181 has 64 divisors (see below), whose sum is σ = 689356800. Its totient is φ = 213192000.

The previous prime is 389969179. The next prime is 389969213. The reversal of 389969181 is 181969983.

It is not a de Polignac number, because 389969181 - 2¹ = 389969179 is a prime.

It is a super-2 number, since 2×389969181² = 304151924259621522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389969131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 591430 + ... + 592088.

It is an arithmetic number, because the mean of its divisors is an integer number (10771200).

Almost surely, 2^389969181 is an apocalyptic number.

389969181 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

389969181 is a deficient number, since it is larger than the sum of its proper divisors (299387619).

389969181 is a wasteful number, since it uses less digits than its factorization.

389969181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 801 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 389969181 is about 19747.6373523518. The cubic root of 389969181 is about 730.5951117678.

The spelling of 389969181 in words is "three hundred eighty-nine million, nine hundred sixty-nine thousand, one hundred eighty-one".