3897657993 has 16 divisors (see below), whose sum is σ = 5597761536. Its totient is φ = 2405285520.

The previous prime is 3897657943. The next prime is 3897658007. The reversal of 3897657993 is 3997567983.

It is not a de Polignac number, because 3897657993 - 2⁹ = 3897657481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3897657943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908955 + ... + 913232.

It is an arithmetic number, because the mean of its divisors is an integer number (349860096).

Almost surely, 2^3897657993 is an apocalyptic number.

It is an amenable number.

3897657993 is a deficient number, since it is larger than the sum of its proper divisors (1700103543).

3897657993 is a wasteful number, since it uses less digits than its factorization.

3897657993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822244.

The product of its digits is 77157360, while the sum is 66.

The square root of 3897657993 is about 62431.2261052112. The cubic root of 3897657993 is about 1573.7457713446.

It can be divided in two parts, 38976 and 57993, that added together give a palindrome (96969).

The spelling of 3897657993 in words is "three billion, eight hundred ninety-seven million, six hundred fifty-seven thousand, nine hundred ninety-three".