22123890 has 24 divisors (see below), whose sum is σ = 57522348. Its totient is φ = 5899680.

The previous prime is 22123889. The next prime is 22123901. The reversal of 22123890 is 9832122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 1846881 = 4503^2 + 1359^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122821 + ... + 123000.

Almost surely, 2^22123890 is an apocalyptic number.

22123890 is an abundant number, since it is smaller than the sum of its proper divisors (35398458).

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

22123890 is a wasteful number, since it uses less digits than its factorization.

22123890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245834 (or 245831 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 22123890 is about 4703.6039374080. The cubic root of 22123890 is about 280.7289255672.

The spelling of 22123890 in words is "twenty-two million, one hundred twenty-three thousand, eight hundred ninety".