389727621 has 24 divisors (see below), whose sum is σ = 571648896. Its totient is φ = 255830400.

The previous prime is 389727587. The next prime is 389727631. The reversal of 389727621 is 126727983.

It is not a de Polignac number, because 389727621 - 2⁷ = 389727493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389727631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164596 + ... + 166946.

It is an arithmetic number, because the mean of its divisors is an integer number (23818704).

Almost surely, 2^389727621 is an apocalyptic number.

It is an amenable number.

389727621 is a deficient number, since it is larger than the sum of its proper divisors (181921275).

389727621 is a wasteful number, since it uses less digits than its factorization.

389727621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633 (or 2630 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 389727621 is about 19741.5202302153. The cubic root of 389727621 is about 730.4442288980. Note that the first 3 decimals are identical.

The spelling of 389727621 in words is "three hundred eighty-nine million, seven hundred twenty-seven thousand, six hundred twenty-one".