22390555 has 16 divisors (see below), whose sum is σ = 29509344. Its totient is φ = 16174080.

The previous prime is 22390553. The next prime is 22390561. The reversal of 22390555 is 55509322.

It is not a de Polignac number, because 22390555 - 2¹ = 22390553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22390553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7339 + ... + 9931.

It is an arithmetic number, because the mean of its divisors is an integer number (1844334).

Almost surely, 2^22390555 is an apocalyptic number.

22390555 is a deficient number, since it is larger than the sum of its proper divisors (7118789).

22390555 is a wasteful number, since it uses less digits than its factorization.

22390555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 22390555 is about 4731.8659110334. The cubic root of 22390555 is about 281.8523236314.

Adding to 22390555 its reverse (55509322), we get a palindrome (77899877).

The spelling of 22390555 in words is "twenty-two million, three hundred ninety thousand, five hundred fifty-five".