389921684 has 6 divisors (see below), whose sum is σ = 682362954. Its totient is φ = 194960840.

The previous prime is 389921683. The next prime is 389921717. The reversal of 389921684 is 486129983.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 379860100 + 10061584 = 19490^2 + 3172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389921683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48740207 + ... + 48740214.

It is an arithmetic number, because the mean of its divisors is an integer number (113727159).

Almost surely, 2^389921684 is an apocalyptic number.

It is an amenable number.

389921684 is a deficient number, since it is larger than the sum of its proper divisors (292441270).

389921684 is a wasteful number, since it uses less digits than its factorization.

389921684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97480425 (or 97480423 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 389921684 is about 19746.4347161709. The cubic root of 389921684 is about 730.5654491802.

The spelling of 389921684 in words is "three hundred eighty-nine million, nine hundred twenty-one thousand, six hundred eighty-four".