22191890 has 32 divisors (see below), whose sum is σ = 46241280. Its totient is φ = 7510464.

The previous prime is 22191887. The next prime is 22191893. The reversal of 22191890 is 9819122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22191887) and next prime (22191893).

It is not an unprimeable number, because it can be changed into a prime (22191893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3524 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (1445040).

Almost surely, 2^22191890 is an apocalyptic number.

22191890 is an abundant number, since it is smaller than the sum of its proper divisors (24049390).

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

22191890 is a wasteful number, since it uses less digits than its factorization.

22191890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 22191890 is about 4710.8268913217. The cubic root of 22191890 is about 281.0162475883.

The spelling of 22191890 in words is "twenty-two million, one hundred ninety-one thousand, eight hundred ninety".