18018442 has 12 divisors (see below), whose sum is σ = 29267190. Its totient is φ = 8316048.

The previous prime is 18018433. The next prime is 18018443. The reversal of 18018442 is 24481081.

It can be written as a sum of positive squares in 3 ways, for example, as 7187761 + 10830681 = 2681^2 + 3291^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18018442.

It is not an unprimeable number, because it can be changed into a prime (18018443) 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, 26317 + ... + 26992.

Almost surely, 2^18018442 is an apocalyptic number.

18018442 is a deficient number, since it is larger than the sum of its proper divisors (11248748).

18018442 is a wasteful number, since it uses less digits than its factorization.

18018442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53337 (or 53324 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 18018442 is about 4244.8135412524. The cubic root of 18018442 is about 262.1636120431.

The spelling of 18018442 in words is "eighteen million, eighteen thousand, four hundred forty-two".