389618129 has 4 divisors (see below), whose sum is σ = 391596084. Its totient is φ = 387640176.

The previous prime is 389618107. The next prime is 389618143. The reversal of 389618129 is 921816983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 921816983 = 461 ⋅1999603.

It can be written as a sum of positive squares in 2 ways, for example, as 312582400 + 77035729 = 17680^2 + 8777^2 .

It is a cyclic number.

It is not a de Polignac number, because 389618129 - 2²⁴ = 372840913 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389618149) 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, 988682 + ... + 989075.

It is an arithmetic number, because the mean of its divisors is an integer number (97899021).

Almost surely, 2^389618129 is an apocalyptic number.

It is an amenable number.

389618129 is a deficient number, since it is larger than the sum of its proper divisors (1977955).

389618129 is a wasteful number, since it uses less digits than its factorization.

389618129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977954.

The product of its digits is 186624, while the sum is 47.

The square root of 389618129 is about 19738.7468953832. The cubic root of 389618129 is about 730.3758176229.

The spelling of 389618129 in words is "three hundred eighty-nine million, six hundred eighteen thousand, one hundred twenty-nine".