3645240 has 64 divisors (see below), whose sum is σ = 11244960. Its totient is φ = 944640.

The previous prime is 3645227. The next prime is 3645251. The reversal of 3645240 is 425463.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3645240.

It is a congruent number.

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, 4030 + ... + 4850.

Almost surely, 2^3645240 is an apocalyptic number.

3645240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3645240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5622480).

3645240 is an abundant number, since it is smaller than the sum of its proper divisors (7599720).

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

3645240 is a wasteful number, since it uses less digits than its factorization.

3645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 3645240 is about 1909.2511621052. The cubic root of 3645240 is about 153.9012128570.

The spelling of 3645240 in words is "three million, six hundred forty-five thousand, two hundred forty".