387989 has 8 divisors (see below), whose sum is σ = 454080. Its totient is φ = 324576.

The previous prime is 387977. The next prime is 388009. The reversal of 387989 is 989783.

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

It is not a de Polignac number, because 387989 - 2⁴ = 387973 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387089) 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, 344 + ... + 945.

It is an arithmetic number, because the mean of its divisors is an integer number (56760).

2³⁸⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

387989 is a deficient number, since it is larger than the sum of its proper divisors (66091).

387989 is a wasteful number, since it uses less digits than its factorization.

387989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339.

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

The square root of 387989 is about 622.8876303155. The cubic root of 387989 is about 72.9356410303.

The spelling of 387989 in words is "three hundred eighty-seven thousand, nine hundred eighty-nine".