389734987 has 2 divisors, whose sum is σ = 389734988. Its totient is φ = 389734986.

The previous prime is 389734909. The next prime is 389734993. The reversal of 389734987 is 789437983.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 389734987 - 2¹⁵ = 389702219 is a prime.

It is not a weakly prime, because it can be changed into another prime (389734907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194867493 + 194867494.

It is an arithmetic number, because the mean of its divisors is an integer number (194867494).

Almost surely, 2^389734987 is an apocalyptic number.

389734987 is a deficient number, since it is larger than the sum of its proper divisors (1).

389734987 is an equidigital number, since it uses as much as digits as its factorization.

389734987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The square root of 389734987 is about 19741.7067904475. The cubic root of 389734987 is about 730.4488307601.

The spelling of 389734987 in words is "three hundred eighty-nine million, seven hundred thirty-four thousand, nine hundred eighty-seven".