18316494 has 72 divisors (see below), whose sum is σ = 48639240. Its totient is φ = 4953312.

The previous prime is 18316483. The next prime is 18316499. The reversal of 18316494 is 49461381.

18316494 is a `hidden beast` number, since 1 + 8 + 3 + 1 + 649 + 4 = 666.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18316499) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16212 + ... + 17304.

It is an arithmetic number, because the mean of its divisors is an integer number (675545).

Almost surely, 2^18316494 is an apocalyptic number.

18316494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18316494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24319620).

18316494 is an abundant number, since it is smaller than the sum of its proper divisors (30322746).

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

18316494 is a wasteful number, since it uses less digits than its factorization.

18316494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134 (or 1124 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18316494 is about 4279.7773306564. Note that the first 3 decimals coincide. The cubic root of 18316494 is about 263.6012402818.

The spelling of 18316494 in words is "eighteen million, three hundred sixteen thousand, four hundred ninety-four".