22198518 has 12 divisors (see below), whose sum is σ = 48096828. Its totient is φ = 7399500.

The previous prime is 22198513. The next prime is 22198591. The reversal of 22198518 is 81589122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22198513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616608 + ... + 616643.

It is an arithmetic number, because the mean of its divisors is an integer number (4008069).

Almost surely, 2^22198518 is an apocalyptic number.

22198518 is an abundant number, since it is smaller than the sum of its proper divisors (25898310).

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

22198518 is a wasteful number, since it uses less digits than its factorization.

22198518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233259 (or 1233256 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 22198518 is about 4711.5303246398. The cubic root of 22198518 is about 281.0442216258.

The spelling of 22198518 in words is "twenty-two million, one hundred ninety-eight thousand, five hundred eighteen".