22155809 has 8 divisors (see below), whose sum is σ = 23987712. Its totient is φ = 20342160.

The previous prime is 22155779. The next prime is 22155823. The reversal of 22155809 is 90855122.

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

It is a cyclic number.

It is not a de Polignac number, because 22155809 - 2¹² = 22151713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22155829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1979 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (2998464).

Almost surely, 2^22155809 is an apocalyptic number.

It is an amenable number.

22155809 is a deficient number, since it is larger than the sum of its proper divisors (1831903).

22155809 is a wasteful number, since it uses less digits than its factorization.

22155809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 22155809 is about 4706.9957510072. The cubic root of 22155809 is about 280.8638668873.

The spelling of 22155809 in words is "twenty-two million, one hundred fifty-five thousand, eight hundred nine".