3654639 has 10 divisors (see below), whose sum is σ = 5459520. Its totient is φ = 2436372.

The previous prime is 3654587. The next prime is 3654641. The reversal of 3654639 is 9364563.

It is not a de Polignac number, because 3654639 - 2⁸ = 3654383 is a prime.

3654639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654689) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 22479 + ... + 22640.

It is an arithmetic number, because the mean of its divisors is an integer number (545952).

Almost surely, 2^3654639 is an apocalyptic number.

3654639 is a deficient number, since it is larger than the sum of its proper divisors (1804881).

3654639 is an equidigital number, since it uses as much as digits as its factorization.

3654639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45131 (or 45122 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 3654639 is about 1911.7110137257. The cubic root of 3654639 is about 154.0333738879.

It can be divided in two parts, 36546 and 39, that added together give a triangular number (36585 = T₂₇₀).

The spelling of 3654639 in words is "three million, six hundred fifty-four thousand, six hundred thirty-nine".