3644940 has 48 divisors (see below), whose sum is σ = 10993248. Its totient is φ = 897024.

The previous prime is 3644899. The next prime is 3644947. The reversal of 3644940 is 494463.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3644898 and 3644907.

It is not an unprimeable number, because it can be changed into a prime (3644947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1557 + ... + 3116.

It is an arithmetic number, because the mean of its divisors is an integer number (229026).

Almost surely, 2^3644940 is an apocalyptic number.

3644940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3644940 is an abundant number, since it is smaller than the sum of its proper divisors (7348308).

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

3644940 is a wasteful number, since it uses less digits than its factorization.

3644940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698 (or 4696 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 3644940 is about 1909.1725956550. The cubic root of 3644940 is about 153.8969907637.

The spelling of 3644940 in words is "three million, six hundred forty-four thousand, nine hundred forty".