389404521 has 12 divisors (see below), whose sum is σ = 613607280. Its totient is φ = 236002680.

The previous prime is 389404501. The next prime is 389404529. The reversal of 389404521 is 125404983.

It is not a de Polignac number, because 389404521 - 2⁹ = 389404009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (389404529) 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, 1966591 + ... + 1966788.

It is an arithmetic number, because the mean of its divisors is an integer number (51133940).

Almost surely, 2^389404521 is an apocalyptic number.

It is an amenable number.

389404521 is a deficient number, since it is larger than the sum of its proper divisors (224202759).

389404521 is a wasteful number, since it uses less digits than its factorization.

389404521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933396 (or 3933393 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 389404521 is about 19733.3352730855. The cubic root of 389404521 is about 730.2423171291.

The spelling of 389404521 in words is "three hundred eighty-nine million, four hundred four thousand, five hundred twenty-one".