390280 has 32 divisors (see below), whose sum is σ = 959040. Its totient is φ = 141760.

The previous prime is 390263. The next prime is 390281. The reversal of 390280 is 82093.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (390281) 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, 4 + ... + 883.

It is an arithmetic number, because the mean of its divisors is an integer number (29970).

2³⁹⁰²⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479520).

390280 is an abundant number, since it is smaller than the sum of its proper divisors (568760).

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

390280 is a wasteful number, since it uses less digits than its factorization.

390280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 390280 is about 624.7239390323. The cubic root of 390280 is about 73.0789163459.

The spelling of 390280 in words is "three hundred ninety thousand, two hundred eighty".