18012436 has 12 divisors (see below), whose sum is σ = 33946612. Its totient is φ = 8313408.

The previous prime is 18012431. The next prime is 18012439. The reversal of 18012436 is 63421081.

It can be written as a sum of positive squares in 2 ways, for example, as 2755600 + 15256836 = 1660^2 + 3906^2 .

It is a super-3 number, since 3×18012436³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18012436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173145 + ... + 173248.

Almost surely, 2^18012436 is an apocalyptic number.

It is an amenable number.

18012436 is a deficient number, since it is larger than the sum of its proper divisors (15934176).

18012436 is a wasteful number, since it uses less digits than its factorization.

18012436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346410 (or 346408 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18012436 is about 4244.1060307207. The cubic root of 18012436 is about 262.1344802304.

The spelling of 18012436 in words is "eighteen million, twelve thousand, four hundred thirty-six".