389666551 has 4 divisors (see below), whose sum is σ = 389713600. Its totient is φ = 389619504.

The previous prime is 389666539. The next prime is 389666561. The reversal of 389666551 is 155666983.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 389666551 - 2⁷ = 389666423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389666495 and 389666504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389666521) 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, 7431 + ... + 28888.

It is an arithmetic number, because the mean of its divisors is an integer number (97428400).

Almost surely, 2^389666551 is an apocalyptic number.

389666551 is a deficient number, since it is larger than the sum of its proper divisors (47049).

389666551 is a wasteful number, since it uses less digits than its factorization.

389666551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47048.

The product of its digits is 1166400, while the sum is 49.

The square root of 389666551 is about 19739.9734295667. The cubic root of 389666551 is about 730.4060735669.

The spelling of 389666551 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, five hundred fifty-one".