3721328 has 20 divisors (see below), whose sum is σ = 7765128. Its totient is φ = 1717440.

The previous prime is 3721327. The next prime is 3721337. The reversal of 3721328 is 8231273.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 3721297 and 3721306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8738 + ... + 9153.

Almost surely, 2^3721328 is an apocalyptic number.

It is an amenable number.

3721328 is an abundant number, since it is smaller than the sum of its proper divisors (4043800).

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

3721328 is a wasteful number, since it uses less digits than its factorization.

3721328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17912 (or 17906 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 3721328 is about 1929.0743894417. The cubic root of 3721328 is about 154.9646537509.

The spelling of 3721328 in words is "three million, seven hundred twenty-one thousand, three hundred twenty-eight".