3969657 has 6 divisors (see below), whose sum is σ = 5733962. Its totient is φ = 2646432.

The previous prime is 3969649. The next prime is 3969659. The reversal of 3969657 is 7569693.

3969657 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 2359296 + 1610361 = 1536^2 + 1269^2 .

It is not a de Polignac number, because 3969657 - 2³ = 3969649 is a prime.

It is a d-powerful number, because it can be written as 3¹² + 9² + 6⁸ + 9³ + 6⁸ + 5⁷ + 7² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3969659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220528 + ... + 220545.

Almost surely, 2^3969657 is an apocalyptic number.

It is an amenable number.

3969657 is a deficient number, since it is larger than the sum of its proper divisors (1764305).

3969657 is a wasteful number, since it uses less digits than its factorization.

3969657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441079 (or 441076 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 3969657 is about 1992.3998092752. The cubic root of 3969657 is about 158.3376983715.

It can be divided in two parts, 39 and 69657, that added together give a palindrome (69696).

The spelling of 3969657 in words is "three million, nine hundred sixty-nine thousand, six hundred fifty-seven".