3654640 has 40 divisors (see below), whose sum is σ = 9271728. Its totient is φ = 1328640.

The previous prime is 3654587. The next prime is 3654641. The reversal of 3654640 is 464563.

3654640 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3654599 and 3654608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654641) 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 7 ways as a sum of consecutive naturals, for example, 1197 + ... + 2956.

Almost surely, 2^3654640 is an apocalyptic number.

It is an amenable number.

3654640 is an abundant number, since it is smaller than the sum of its proper divisors (5617088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3654640 is a wasteful number, since it uses less digits than its factorization.

3654640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177 (or 4171 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 3654640 is about 1911.7112752715. The cubic root of 3654640 is about 154.0333879371.

It can be divided in two parts, 365 and 4640, that added together give a palindrome (5005).

The spelling of 3654640 in words is "three million, six hundred fifty-four thousand, six hundred forty".