389396987 has 4 divisors (see below), whose sum is σ = 445025136. Its totient is φ = 333768840.

The previous prime is 389396981. The next prime is 389397037. The reversal of 389396987 is 789693983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 389396987 - 2⁴ = 389396971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389396981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27814064 + ... + 27814077.

It is an arithmetic number, because the mean of its divisors is an integer number (111256284).

Almost surely, 2^389396987 is an apocalyptic number.

389396987 is a deficient number, since it is larger than the sum of its proper divisors (55628149).

389396987 is an equidigital number, since it uses as much as digits as its factorization.

389396987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55628148.

The product of its digits is 17635968, while the sum is 62.

The square root of 389396987 is about 19733.1443769106. The cubic root of 389396987 is about 730.2376076468.

The spelling of 389396987 in words is "three hundred eighty-nine million, three hundred ninety-six thousand, nine hundred eighty-seven".