3920280 has 128 divisors (see below), whose sum is σ = 14515200. Its totient is φ = 824832.

The previous prime is 3920269. The next prime is 3920299. The reversal of 3920280 is 820293.

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 3920280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10741 + ... + 11099.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

Almost surely, 2^3920280 is an apocalyptic number.

3920280 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 3920280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7257600).

3920280 is an abundant number, since it is smaller than the sum of its proper divisors (10594920).

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

3920280 is a wasteful number, since it uses less digits than its factorization.

3920280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 3920280 is about 1979.9696967378. The cubic root of 3920280 is about 157.6784573323.

The spelling of 3920280 in words is "three million, nine hundred twenty thousand, two hundred eighty".