3989280 has 48 divisors (see below), whose sum is σ = 12567744. Its totient is φ = 1063680.

The previous prime is 3989267. The next prime is 3989287. The reversal of 3989280 is 829893.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (3989287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3676 + ... + 4635.

It is an arithmetic number, because the mean of its divisors is an integer number (261828).

Almost surely, 2^3989280 is an apocalyptic number.

3989280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3989280 is an abundant number, since it is smaller than the sum of its proper divisors (8578464).

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

3989280 is a wasteful number, since it uses less digits than its factorization.

3989280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8329 (or 8321 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 3989280 is about 1997.3182019899. The cubic root of 3989280 is about 158.5981704989.

The spelling of 3989280 in words is "three million, nine hundred eighty-nine thousand, two hundred eighty".