3897649 has 16 divisors (see below), whose sum is σ = 4764672. Its totient is φ = 3115728.

The previous prime is 3897637. The next prime is 3897653. The reversal of 3897649 is 9467983.

It is not a de Polignac number, because 3897649 - 2⁷ = 3897521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3897599 and 3897608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897659) 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, 6642 + ... + 7204.

It is an arithmetic number, because the mean of its divisors is an integer number (297792).

Almost surely, 2^3897649 is an apocalyptic number.

It is an amenable number.

3897649 is a deficient number, since it is larger than the sum of its proper divisors (867023).

3897649 is a wasteful number, since it uses less digits than its factorization.

3897649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 326592, while the sum is 46.

The square root of 3897649 is about 1974.2464385177. The cubic root of 3897649 is about 157.3744560985.

The spelling of 3897649 in words is "three million, eight hundred ninety-seven thousand, six hundred forty-nine".