18013155 has 32 divisors (see below), whose sum is σ = 29652480. Its totient is φ = 9335040.

The previous prime is 18013153. The next prime is 18013181. The reversal of 18013155 is 55131081.

It is not a de Polignac number, because 18013155 - 2¹ = 18013153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18013153) 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, 137440 + ... + 137570.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^18013155 is an apocalyptic number.

18013155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18013155 is a deficient number, since it is larger than the sum of its proper divisors (11639325).

18013155 is a wasteful number, since it uses less digits than its factorization.

18013155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 18013155 is about 4244.1907355820. The cubic root of 18013155 is about 262.1379680463.

The spelling of 18013155 in words is "eighteen million, thirteen thousand, one hundred fifty-five".