389851977 has 4 divisors (see below), whose sum is σ = 519802640. Its totient is φ = 259901316.

The previous prime is 389851967. The next prime is 389851991. The reversal of 389851977 is 779158983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 389851977 - 2²² = 385657673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389851927) 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, 64975327 + ... + 64975332.

It is an arithmetic number, because the mean of its divisors is an integer number (129950660).

Almost surely, 2^389851977 is an apocalyptic number.

It is an amenable number.

389851977 is a deficient number, since it is larger than the sum of its proper divisors (129950663).

389851977 is a wasteful number, since it uses less digits than its factorization.

389851977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129950662.

The product of its digits is 3810240, while the sum is 57.

The square root of 389851977 is about 19744.6695844727. The cubic root of 389851977 is about 730.5219117531.

The spelling of 389851977 in words is "three hundred eighty-nine million, eight hundred fifty-one thousand, nine hundred seventy-seven".