18078436 has 12 divisors (see below), whose sum is σ = 31667328. Its totient is φ = 9030632.

The previous prime is 18078433. The next prime is 18078449. The reversal of 18078436 is 63487081.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18078395 and 18078404.

It is not an unprimeable number, because it can be changed into a prime (18078433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6165 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (2638944).

Almost surely, 2^18078436 is an apocalyptic number.

It is an amenable number.

18078436 is a deficient number, since it is larger than the sum of its proper divisors (13588892).

18078436 is a wasteful number, since it uses less digits than its factorization.

18078436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298 (or 4296 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18078436 is about 4251.8744101866. The cubic root of 18078436 is about 262.4542553697.

The spelling of 18078436 in words is "eighteen million, seventy-eight thousand, four hundred thirty-six".