22390906 has 4 divisors (see below), whose sum is σ = 33586362. Its totient is φ = 11195452.

The previous prime is 22390829. The next prime is 22390919. The reversal of 22390906 is 60909322.

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

It can be written as a sum of positive squares in only one way, i.e., 22174681 + 216225 = 4709^2 + 465^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5597725 + ... + 5597728.

Almost surely, 2^22390906 is an apocalyptic number.

22390906 is a deficient number, since it is larger than the sum of its proper divisors (11195456).

22390906 is a wasteful number, since it uses less digits than its factorization.

22390906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11195455.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 22390906 is about 4731.9029998511. The cubic root of 22390906 is about 281.8537964198.

The spelling of 22390906 in words is "twenty-two million, three hundred ninety thousand, nine hundred six".