18012558 has 16 divisors (see below), whose sum is σ = 36533376. Its totient is φ = 5919480.

The previous prime is 18012541. The next prime is 18012559. The reversal of 18012558 is 85521081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20716 + ... + 21567.

It is an arithmetic number, because the mean of its divisors is an integer number (2283336).

Almost surely, 2^18012558 is an apocalyptic number.

18012558 is an abundant number, since it is smaller than the sum of its proper divisors (18520818).

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

18012558 is a wasteful number, since it uses less digits than its factorization.

18012558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42359.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18012558 is about 4244.1204035701. The cubic root of 18012558 is about 262.1350720500.

The spelling of 18012558 in words is "eighteen million, twelve thousand, five hundred fifty-eight".