18225155 has 16 divisors (see below), whose sum is σ = 23665824. Its totient is φ = 13393920.

The previous prime is 18225133. The next prime is 18225157. The reversal of 18225155 is 55152281.

It is not a de Polignac number, because 18225155 - 2⁶ = 18225091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18225157) 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, 16160 + ... + 17250.

It is an arithmetic number, because the mean of its divisors is an integer number (1479114).

Almost surely, 2^18225155 is an apocalyptic number.

18225155 is a deficient number, since it is larger than the sum of its proper divisors (5440669).

18225155 is a wasteful number, since it uses less digits than its factorization.

18225155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

The product of its digits is 4000, while the sum is 29.

The square root of 18225155 is about 4269.0929950049. The cubic root of 18225155 is about 263.1623424827.

The spelling of 18225155 in words is "eighteen million, two hundred twenty-five thousand, one hundred fifty-five".