3722640 has 40 divisors (see below), whose sum is σ = 11540928. Its totient is φ = 992640.

The previous prime is 3722629. The next prime is 3722683. The reversal of 3722640 is 462273.

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

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3722640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7516 + ... + 7995.

Almost surely, 2^3722640 is an apocalyptic number.

3722640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3722640 is an abundant number, since it is smaller than the sum of its proper divisors (7818288).

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

3722640 is a wasteful number, since it uses less digits than its factorization.

3722640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15527 (or 15521 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 3722640 is about 1929.4144189365. The cubic root of 3722640 is about 154.9828631765.

The spelling of 3722640 in words is "three million, seven hundred twenty-two thousand, six hundred forty".