3721920 has 56 divisors (see below), whose sum is σ = 11820144. Its totient is φ = 992256.

The previous prime is 3721919. The next prime is 3721931. The reversal of 3721920 is 291273.

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

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, 979 + ... + 2898.

It is an arithmetic number, because the mean of its divisors is an integer number (211074).

Almost surely, 2^3721920 is an apocalyptic number.

3721920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3721920 is an abundant number, since it is smaller than the sum of its proper divisors (8098224).

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

3721920 is a wasteful number, since it uses less digits than its factorization.

3721920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897 (or 3887 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 3721920 is about 1929.2278248045. The cubic root of 3721920 is about 154.9728707288.

The spelling of 3721920 in words is "three million, seven hundred twenty-one thousand, nine hundred twenty".