3889557621 has 12 divisors (see below), whose sum is σ = 5913947520. Its totient is φ = 2456562600.

The previous prime is 3889557613. The next prime is 3889557629. The reversal of 3889557621 is 1267559883.

3889557621 is a `hidden beast` number, since 3 + 8 + 8 + 9 + 5 + 5 + 7 + 621 = 666.

It is an interprime number because it is at equal distance from previous prime (3889557613) and next prime (3889557629).

It is not a de Polignac number, because 3889557621 - 2³ = 3889557613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3889557629) 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, 11372805 + ... + 11373146.

It is an arithmetic number, because the mean of its divisors is an integer number (492828960).

Almost surely, 2^3889557621 is an apocalyptic number.

It is an amenable number.

3889557621 is a deficient number, since it is larger than the sum of its proper divisors (2024389899).

3889557621 is a wasteful number, since it uses less digits than its factorization.

3889557621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22745976 (or 22745973 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 3889557621 is about 62366.3180009851. The cubic root of 3889557621 is about 1572.6547941808.

The spelling of 3889557621 in words is "three billion, eight hundred eighty-nine million, five hundred fifty-seven thousand, six hundred twenty-one".