18481155 has 32 divisors (see below), whose sum is σ = 36868608. Its totient is φ = 7680000.

The previous prime is 18481097. The next prime is 18481157. The reversal of 18481155 is 55118481.

It is not a de Polignac number, because 18481155 - 2¹³ = 18472963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18481157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6846 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (1152144).

Almost surely, 2^18481155 is an apocalyptic number.

18481155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18481155 is a deficient number, since it is larger than the sum of its proper divisors (18387453).

18481155 is a wasteful number, since it uses less digits than its factorization.

18481155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16027.

The product of its digits is 6400, while the sum is 33.

The square root of 18481155 is about 4298.9713885998. The cubic root of 18481155 is about 264.3887895272.

It can be divided in two parts, 1848 and 1155, that added together give a palindrome (3003).

The spelling of 18481155 in words is "eighteen million, four hundred eighty-one thousand, one hundred fifty-five".