22197977 has 4 divisors (see below), whose sum is σ = 22211556. Its totient is φ = 22184400.

The previous prime is 22197943. The next prime is 22197979. The reversal of 22197977 is 77979122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 12187081 = 3164^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 22197977 - 2¹⁰ = 22196953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22197979) 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, 3938 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (5552889).

Almost surely, 2^22197977 is an apocalyptic number.

It is an amenable number.

22197977 is a deficient number, since it is larger than the sum of its proper divisors (13579).

22197977 is a wasteful number, since it uses less digits than its factorization.

22197977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13578.

The product of its digits is 111132, while the sum is 44.

The square root of 22197977 is about 4711.4729119459. The cubic root of 22197977 is about 281.0419384980.

The spelling of 22197977 in words is "twenty-two million, one hundred ninety-seven thousand, nine hundred seventy-seven".