22185000 has 240 divisors, whose sum is σ = 82239300. Its totient is φ = 5376000.

The previous prime is 22184999. The next prime is 22185013. The reversal of 22185000 is 58122.

It can be written as a sum of positive squares in 10 ways, for example, as 338724 + 21846276 = 582^2 + 4674^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 764986 + ... + 765014.

Almost surely, 2^22185000 is an apocalyptic number.

22185000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22185000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41119650).

22185000 is an abundant number, since it is smaller than the sum of its proper divisors (60054300).

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

22185000 is a wasteful number, since it uses less digits than its factorization.

22185000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 22185000 is about 4710.0955404323. The cubic root of 22185000 is about 280.9871618523.

The spelling of 22185000 in words is "twenty-two million, one hundred eighty-five thousand".