228390 has 32 divisors (see below), whose sum is σ = 573696. Its totient is φ = 58080.

The previous prime is 228383. The next prime is 228409. The reversal of 228390 is 93822.

It is a self number, because there is not a number n which added to its sum of digits gives 228390.

It is a congruent number.

It is an unprimeable number.

228390 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 15 ways as a sum of consecutive naturals, for example, 525 + ... + 855.

It is an arithmetic number, because the mean of its divisors is an integer number (17928).

2²²⁸³⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286848).

228390 is an abundant number, since it is smaller than the sum of its proper divisors (345306).

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

228390 is a wasteful number, since it uses less digits than its factorization.

228390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

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

The square root of 228390 is about 477.9016635250. The cubic root of 228390 is about 61.1259602728.

The spelling of 228390 in words is "two hundred twenty-eight thousand, three hundred ninety".