22197857 has 4 divisors (see below), whose sum is σ = 24215856. Its totient is φ = 20179860.

The previous prime is 22197827. The next prime is 22197859. The reversal of 22197857 is 75879122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22197857 - 2⁸ = 22197601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22197859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008983 + ... + 1009004.

It is an arithmetic number, because the mean of its divisors is an integer number (6053964).

Almost surely, 2^22197857 is an apocalyptic number.

It is an amenable number.

22197857 is a deficient number, since it is larger than the sum of its proper divisors (2017999).

22197857 is a wasteful number, since it uses less digits than its factorization.

22197857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017998.

The product of its digits is 70560, while the sum is 41.

The square root of 22197857 is about 4711.4601770576. The cubic root of 22197857 is about 281.0414320691.

The spelling of 22197857 in words is "twenty-two million, one hundred ninety-seven thousand, eight hundred fifty-seven".