3897216842 has 16 divisors (see below), whose sum is σ = 5878817664. Its totient is φ = 1937628000.

The previous prime is 3897216803. The next prime is 3897216859. The reversal of 3897216842 is 2486127983.

3897216842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×3897216842² = 30376598227136905928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553967 + ... + 560957.

It is an arithmetic number, because the mean of its divisors is an integer number (367426104).

Almost surely, 2^3897216842 is an apocalyptic number.

3897216842 is a deficient number, since it is larger than the sum of its proper divisors (1981600822).

3897216842 is a wasteful number, since it uses less digits than its factorization.

3897216842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8525.

The product of its digits is 1161216, while the sum is 50.

The square root of 3897216842 is about 62427.6929094773. The cubic root of 3897216842 is about 1573.6863950288.

The spelling of 3897216842 in words is "three billion, eight hundred ninety-seven million, two hundred sixteen thousand, eight hundred forty-two".