389987 has 8 divisors (see below), whose sum is σ = 425040. Its totient is φ = 355680.

The previous prime is 389981. The next prime is 389989. The reversal of 389987 is 789983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 389987 - 2⁴ = 389971 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 389987.

It is not an unprimeable number, because it can be changed into a prime (389981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (53130).

2³⁸⁹⁹⁸⁷ is an apocalyptic number.

389987 is a deficient number, since it is larger than the sum of its proper divisors (35053).

389987 is a wasteful number, since it uses less digits than its factorization.

389987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its digits is 108864, while the sum is 44.

The square root of 389987 is about 624.4893914231. The cubic root of 389987 is about 73.0606239379.

The spelling of 389987 in words is "three hundred eighty-nine thousand, nine hundred eighty-seven".