18042786 has 12 divisors (see below), whose sum is σ = 39092742. Its totient is φ = 6014256.

The previous prime is 18042781. The next prime is 18042793. The reversal of 18042786 is 68724081.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 4756761 = 3645^2 + 2181^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18042786.

It is not an unprimeable number, because it can be changed into a prime (18042781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 501171 + ... + 501206.

Almost surely, 2^18042786 is an apocalyptic number.

18042786 is an abundant number, since it is smaller than the sum of its proper divisors (21049956).

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

18042786 is a wasteful number, since it uses less digits than its factorization.

18042786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002385 (or 1002382 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18042786 is about 4247.6800726985. The cubic root of 18042786 is about 262.2816251862.

The spelling of 18042786 in words is "eighteen million, forty-two thousand, seven hundred eighty-six".