3647997 has 20 divisors (see below), whose sum is σ = 5641020. Its totient is φ = 2346624.

The previous prime is 3647989. The next prime is 3648031. The reversal of 3647997 is 7997463.

It can be written as a sum of positive squares in 2 ways, for example, as 1052676 + 2595321 = 1026^2 + 1611^2 .

It is not a de Polignac number, because 3647997 - 2³ = 3647989 is a prime.

It is a super-2 number, since 2×3647997² = 26615764224018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3647927) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1573 + ... + 3125.

It is an arithmetic number, because the mean of its divisors is an integer number (282051).

Almost surely, 2^3647997 is an apocalyptic number.

It is an amenable number.

3647997 is a deficient number, since it is larger than the sum of its proper divisors (1993023).

3647997 is a wasteful number, since it uses less digits than its factorization.

3647997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1585 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 3647997 is about 1909.9730364589. The cubic root of 3647997 is about 153.9400030526.

The spelling of 3647997 in words is "three million, six hundred forty-seven thousand, nine hundred ninety-seven".