18595221 has 16 divisors (see below), whose sum is σ = 25918464. Its totient is φ = 11847024.

The previous prime is 18595183. The next prime is 18595223. The reversal of 18595221 is 12259581.

It is not a de Polignac number, because 18595221 - 2¹³ = 18587029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18595223) 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, 4530 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (1619904).

Almost surely, 2^18595221 is an apocalyptic number.

It is an amenable number.

18595221 is a deficient number, since it is larger than the sum of its proper divisors (7323243).

18595221 is a wasteful number, since it uses less digits than its factorization.

18595221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160.

The product of its digits is 7200, while the sum is 33.

The square root of 18595221 is about 4312.2176429304. The cubic root of 18595221 is about 264.9316116394.

The spelling of 18595221 in words is "eighteen million, five hundred ninety-five thousand, two hundred twenty-one".