3647665 has 16 divisors (see below), whose sum is σ = 5063040. Its totient is φ = 2471040.

The previous prime is 3647641. The next prime is 3647671. The reversal of 3647665 is 5667463.

It is not a de Polignac number, because 3647665 - 2¹³ = 3639473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2530 + ... + 3700.

It is an arithmetic number, because the mean of its divisors is an integer number (316440).

Almost surely, 2^3647665 is an apocalyptic number.

3647665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3647665 is a deficient number, since it is larger than the sum of its proper divisors (1415375).

3647665 is a wasteful number, since it uses less digits than its factorization.

3647665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its digits is 90720, while the sum is 37.

The square root of 3647665 is about 1909.8861222596. The cubic root of 3647665 is about 153.9353329435.

The spelling of 3647665 in words is "three million, six hundred forty-seven thousand, six hundred sixty-five".