222222172 has 6 divisors (see below), whose sum is σ = 388888808. Its totient is φ = 111111084.

The previous prime is 222222149. The next prime is 222222193. The reversal of 222222172 is 271222222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777768 + ... + 27777775.

Almost surely, 2^222222172 is an apocalyptic number.

It is an amenable number.

222222172 is a deficient number, since it is larger than the sum of its proper divisors (166666636).

222222172 is a wasteful number, since it uses less digits than its factorization.

222222172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55555547 (or 55555545 counting only the distinct ones).

The product of its digits is 896, while the sum is 22.

The square root of 222222172 is about 14907.1181654940. The cubic root of 222222172 is about 605.7068186475.

Adding to 222222172 its reverse (271222222), we get a palindrome (493444394).

Subtracting 222222172 from its reverse (271222222), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 222222172 in words is "two hundred twenty-two million, two hundred twenty-two thousand, one hundred seventy-two".