18409768 has 32 divisors (see below), whose sum is σ = 37384200. Its totient is φ = 8448768.

The previous prime is 18409763. The next prime is 18409777. The reversal of 18409768 is 86790481.

It can be written as a sum of positive squares in 4 ways, for example, as 12659364 + 5750404 = 3558^2 + 2398^2 .

It is not an unprimeable number, because it can be changed into a prime (18409763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23430 + ... + 24202.

Almost surely, 2^18409768 is an apocalyptic number.

It is an amenable number.

18409768 is an abundant number, since it is smaller than the sum of its proper divisors (18974432).

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

18409768 is a wasteful number, since it uses less digits than its factorization.

18409768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18409768 is about 4290.6605552059. The cubic root of 18409768 is about 264.0479328332.

The spelling of 18409768 in words is "eighteen million, four hundred nine thousand, seven hundred sixty-eight".