389666503 has 12 divisors (see below), whose sum is σ = 420970680. Its totient is φ = 360513152.

The previous prime is 389666489. The next prime is 389666513. The reversal of 389666503 is 305666983.

It is not a de Polignac number, because 389666503 - 2⁵ = 389666471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389666513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5625 + ... + 28477.

It is an arithmetic number, because the mean of its divisors is an integer number (35080890).

Almost surely, 2^389666503 is an apocalyptic number.

389666503 is a deficient number, since it is larger than the sum of its proper divisors (31304177).

389666503 is a wasteful number, since it uses less digits than its factorization.

389666503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22946 (or 22929 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 389666503 is about 19739.9722137596. The cubic root of 389666503 is about 730.4060435759.

The spelling of 389666503 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, five hundred three".