22158390 has 64 divisors (see below), whose sum is σ = 54991872. Its totient is φ = 5712000.

The previous prime is 22158371. The next prime is 22158391. The reversal of 22158390 is 9385122.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22158391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215079 + ... + 215181.

It is an arithmetic number, because the mean of its divisors is an integer number (859248).

Almost surely, 2^22158390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22158390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27495936).

22158390 is an abundant number, since it is smaller than the sum of its proper divisors (32833482).

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

22158390 is a wasteful number, since it uses less digits than its factorization.

22158390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 22158390 is about 4707.2699094061. The cubic root of 22158390 is about 280.8747727027.

The spelling of 22158390 in words is "twenty-two million, one hundred fifty-eight thousand, three hundred ninety".