389815972 has 36 divisors (see below), whose sum is σ = 854602140. Its totient is φ = 154211904.

The previous prime is 389815957. The next prime is 389815981. The reversal of 389815972 is 279518983.

It can be written as a sum of positive squares in 2 ways, for example, as 18714276 + 371101696 = 4326^2 + 19264^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a zygodrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73947 + ... + 79042.

Almost surely, 2^389815972 is an apocalyptic number.

It is an amenable number.

389815972 is an abundant number, since it is smaller than the sum of its proper divisors (464786168).

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

389815972 is a wasteful number, since it uses less digits than its factorization.

389815972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153020 (or 153011 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 389815972 is about 19743.7577983524. The cubic root of 389815972 is about 730.4994218058.

The spelling of 389815972 in words is "three hundred eighty-nine million, eight hundred fifteen thousand, nine hundred seventy-two".