18161798 has 8 divisors (see below), whose sum is σ = 27492960. Its totient is φ = 8997480.

The previous prime is 18161791. The next prime is 18161807. The reversal of 18161798 is 89716181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161791) 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, 41438 + ... + 41873.

It is an arithmetic number, because the mean of its divisors is an integer number (3436620).

Almost surely, 2^18161798 is an apocalyptic number.

18161798 is a deficient number, since it is larger than the sum of its proper divisors (9331162).

18161798 is a wasteful number, since it uses less digits than its factorization.

18161798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83422.

The product of its digits is 24192, while the sum is 41.

The square root of 18161798 is about 4261.6661061139. Note that the first 3 decimals coincide. The cubic root of 18161798 is about 262.8570403783.

The spelling of 18161798 in words is "eighteen million, one hundred sixty-one thousand, seven hundred ninety-eight".