18005274 has 128 divisors (see below), whose sum is σ = 50688000. Its totient is φ = 4618944.

The previous prime is 18005269. The next prime is 18005279. The reversal of 18005274 is 47250081.

It is an interprime number because it is at equal distance from previous prime (18005269) and next prime (18005279).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005279) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165132 + ... + 165240.

It is an arithmetic number, because the mean of its divisors is an integer number (396000).

Almost surely, 2^18005274 is an apocalyptic number.

18005274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18005274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25344000).

18005274 is an abundant number, since it is smaller than the sum of its proper divisors (32682726).

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

18005274 is a wasteful number, since it uses less digits than its factorization.

18005274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18005274 is about 4243.2621884583. The cubic root of 18005274 is about 262.0997328290.

The spelling of 18005274 in words is "eighteen million, five thousand, two hundred seventy-four".