1398222 has 56 divisors (see below), whose sum is σ = 3620016. Its totient is φ = 396576.

The previous prime is 1398217. The next prime is 1398227. The reversal of 1398222 is 2228931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1398217) and next prime (1398227).

It is a super-2 number, since 2×1398222² = 3910049522568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398227) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 10138 + ... + 10274.

2^1398222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1810008).

1398222 is an abundant number, since it is smaller than the sum of its proper divisors (2221794).

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

1398222 is an equidigital number, since it uses as much as digits as its factorization.

1398222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 149 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1398222 is about 1182.4643757847. The cubic root of 1398222 is about 111.8215163140.

The spelling of 1398222 in words is "one million, three hundred ninety-eight thousand, two hundred twenty-two".