1390228 has 36 divisors (see below), whose sum is σ = 2915892. Its totient is φ = 577920.

The previous prime is 1390219. The next prime is 1390241. The reversal of 1390228 is 8220931.

It can be written as a sum of positive squares in 2 ways, for example, as 636804 + 753424 = 798^2 + 868^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7950 + ... + 8122.

It is an arithmetic number, because the mean of its divisors is an integer number (80997).

2^1390228 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 1390228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1457946).

1390228 is an abundant number, since it is smaller than the sum of its proper divisors (1525664).

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

1390228 is a wasteful number, since it uses less digits than its factorization.

1390228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1390228 is about 1179.0793018283. The cubic root of 1390228 is about 111.6080046330.

The spelling of 1390228 in words is "one million, three hundred ninety thousand, two hundred twenty-eight".