389992 has 24 divisors (see below), whose sum is σ = 775350. Its totient is φ = 183680.

The previous prime is 389989. The next prime is 389999. The reversal of 389992 is 299983.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 133956 + 256036 = 366^2 + 506^2 .

Its product of digits (34992) is a multiple of the sum of its prime divisors (72).

It is not an unprimeable number, because it can be changed into a prime (389999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9492 + ... + 9532.

2³⁸⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

389992 is a deficient number, since it is larger than the sum of its proper divisors (385358).

389992 is a wasteful number, since it uses less digits than its factorization.

389992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 72 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 389992 is about 624.4933946808. The cubic root of 389992 is about 73.0609361718.

Subtracting from 389992 its reverse (299983), we obtain a palindrome (90009).

The spelling of 389992 in words is "three hundred eighty-nine thousand, nine hundred ninety-two".