3654665 has 16 divisors (see below), whose sum is σ = 5116800. Its totient is φ = 2504880.

The previous prime is 3654647. The next prime is 3654671. The reversal of 3654665 is 5664563.

It is a de Polignac number, because none of the positive numbers 2^k-3654665 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 650 + ... + 2780.

It is an arithmetic number, because the mean of its divisors is an integer number (319800).

Almost surely, 2^3654665 is an apocalyptic number.

3654665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3654665 is a deficient number, since it is larger than the sum of its proper divisors (1462135).

3654665 is an equidigital number, since it uses as much as digits as its factorization.

3654665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2143 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The square root of 3654665 is about 1911.7178139046. The cubic root of 3654665 is about 154.0337391642.

It can be divided in two parts, 3654 and 665, that multiplied together give a triangular number (2429910 = T₂₂₀₄).

The spelling of 3654665 in words is "three million, six hundred fifty-four thousand, six hundred sixty-five".