18078494 has 8 divisors (see below), whose sum is σ = 30991728. Its totient is φ = 7747920.

The previous prime is 18078491. The next prime is 18078521. The reversal of 18078494 is 49487081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18078494³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18078491) 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, 645647 + ... + 645674.

It is an arithmetic number, because the mean of its divisors is an integer number (3873966).

Almost surely, 2^18078494 is an apocalyptic number.

18078494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18078494 is a deficient number, since it is larger than the sum of its proper divisors (12913234).

18078494 is a wasteful number, since it uses less digits than its factorization.

18078494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291330.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 18078494 is about 4251.8812307025. The cubic root of 18078494 is about 262.4545360416.

It can be divided in two parts, 1807 and 8494, that added together give a palindrome (10301).

The spelling of 18078494 in words is "eighteen million, seventy-eight thousand, four hundred ninety-four".