222640123 has 4 divisors (see below), whose sum is σ = 224935480. Its totient is φ = 220344768.

The previous prime is 222640087. The next prime is 222640151. The reversal of 222640123 is 321046222.

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

It is a cyclic number.

It is not a de Polignac number, because 222640123 - 2¹⁷ = 222509051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222640094 and 222640103.

It is not an unprimeable number, because it can be changed into a prime (222640193) 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, 1147533 + ... + 1147726.

It is an arithmetic number, because the mean of its divisors is an integer number (56233870).

Almost surely, 2^222640123 is an apocalyptic number.

222640123 is a deficient number, since it is larger than the sum of its proper divisors (2295357).

222640123 is an equidigital number, since it uses as much as digits as its factorization.

222640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2295356.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 222640123 is about 14921.1300845479. The cubic root of 222640123 is about 606.0863145724.

Adding to 222640123 its reverse (321046222), we get a palindrome (543686345).

The spelling of 222640123 in words is "two hundred twenty-two million, six hundred forty thousand, one hundred twenty-three".