22155999 has 8 divisors (see below), whose sum is σ = 29692080. Its totient is φ = 14695296.

The previous prime is 22155989. The next prime is 22156003. The reversal of 22155999 is 99955122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22155999 - 2⁹ = 22155487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22155999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155989) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 18154 + ... + 19335.

It is an arithmetic number, because the mean of its divisors is an integer number (3711510).

Almost surely, 2^22155999 is an apocalyptic number.

22155999 is a deficient number, since it is larger than the sum of its proper divisors (7536081).

22155999 is a wasteful number, since it uses less digits than its factorization.

22155999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37689.

The product of its digits is 72900, while the sum is 42.

The square root of 22155999 is about 4707.0159336888. The cubic root of 22155999 is about 280.8646697464.

The spelling of 22155999 in words is "twenty-two million, one hundred fifty-five thousand, nine hundred ninety-nine".