18040616 has 24 divisors (see below), whose sum is σ = 37182810. Its totient is φ = 8199840.

The previous prime is 18040609. The next prime is 18040637. The reversal of 18040616 is 61604081.

It can be written as a sum of positive squares in only one way, i.e., 18028516 + 12100 = 4246^2 + 110^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8351 + ... + 10286.

Almost surely, 2^18040616 is an apocalyptic number.

It is an amenable number.

18040616 is an abundant number, since it is smaller than the sum of its proper divisors (19142194).

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

18040616 is a wasteful number, since it uses less digits than its factorization.

18040616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18665 (or 18650 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18040616 is about 4247.4246314679. The cubic root of 18040616 is about 262.2711099227.

Adding to 18040616 its reverse (61604081), we get a palindrome (79644697).

The spelling of 18040616 in words is "eighteen million, forty thousand, six hundred sixteen".