3897159021 has 16 divisors (see below), whose sum is σ = 6598364800. Its totient is φ = 2226947904.

The previous prime is 3897159011. The next prime is 3897159041. The reversal of 3897159021 is 1209517983.

3897159021 is a `hidden beast` number, since 38 + 9 + 7 + 1 + 590 + 21 = 666.

It is not a de Polignac number, because 3897159021 - 2¹⁵ = 3897126253 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 (3897159011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10309756 + ... + 10310133.

It is an arithmetic number, because the mean of its divisors is an integer number (412397800).

Almost surely, 2^3897159021 is an apocalyptic number.

It is an amenable number.

3897159021 is a deficient number, since it is larger than the sum of its proper divisors (2701205779).

3897159021 is a wasteful number, since it uses less digits than its factorization.

3897159021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20619905 (or 20619899 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 3897159021 is about 62427.2298039886. The cubic root of 3897159021 is about 1573.6786123320.

The spelling of 3897159021 in words is "three billion, eight hundred ninety-seven million, one hundred fifty-nine thousand, twenty-one".