18117270 has 40 divisors (see below), whose sum is σ = 48717504. Its totient is φ = 4831056.

The previous prime is 18117251. The next prime is 18117271. The reversal of 18117270 is 7271181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18117271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10374 + ... + 11993.

Almost surely, 2^18117270 is an apocalyptic number.

18117270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18117270 is an abundant number, since it is smaller than the sum of its proper divisors (30600234).

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

18117270 is a wasteful number, since it uses less digits than its factorization.

18117270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22386 (or 22377 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 18117270 is about 4256.4386522068. The cubic root of 18117270 is about 262.6420455706.

The spelling of 18117270 in words is "eighteen million, one hundred seventeen thousand, two hundred seventy".