388290 has 48 divisors (see below), whose sum is σ = 1090368. Its totient is φ = 86688.

The previous prime is 388277. The next prime is 388301. The reversal of 388290 is 92883.

388290 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

388290 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9009 + ... + 9051.

It is an arithmetic number, because the mean of its divisors is an integer number (22716).

2³⁸⁸²⁹⁰ is an apocalyptic number.

388290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 388290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545184).

388290 is an abundant number, since it is smaller than the sum of its proper divisors (702078).

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

388290 is a wasteful number, since it uses less digits than its factorization.

388290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 388290 is about 623.1292000861. The cubic root of 388290 is about 72.9544971948.

The spelling of 388290 in words is "three hundred eighty-eight thousand, two hundred ninety".