3897729 has 12 divisors (see below), whose sum is σ = 6142032. Its totient is φ = 2362200.

The previous prime is 3897727. The next prime is 3897739. The reversal of 3897729 is 9277983.

It is not a de Polignac number, because 3897729 - 2¹ = 3897727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3897721) 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, 19587 + ... + 19784.

It is an arithmetic number, because the mean of its divisors is an integer number (511836).

Almost surely, 2^3897729 is an apocalyptic number.

It is an amenable number.

3897729 is a deficient number, since it is larger than the sum of its proper divisors (2244303).

3897729 is a wasteful number, since it uses less digits than its factorization.

3897729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39388 (or 39385 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 3897729 is about 1974.2666993089. The cubic root of 3897729 is about 157.3755328048.

It can be divided in two parts, 389 and 7729, that added together give a palindrome (8118).

The spelling of 3897729 in words is "three million, eight hundred ninety-seven thousand, seven hundred twenty-nine".