390780 has 72 divisors (see below), whose sum is σ = 1284192. Its totient is φ = 95616.

The previous prime is 390763. The next prime is 390781. The reversal of 390780 is 87093.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390781) by changing a digit.

390780 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2257 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (17836).

2³⁹⁰⁷⁸⁰ is an apocalyptic number.

390780 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 390780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642096).

390780 is an abundant number, since it is smaller than the sum of its proper divisors (893412).

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

390780 is a wasteful number, since it uses less digits than its factorization.

390780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 390780 is about 625.1239877016. The cubic root of 390780 is about 73.1101109287.

The spelling of 390780 in words is "three hundred ninety thousand, seven hundred eighty".