18142798 has 4 divisors (see below), whose sum is σ = 27214200. Its totient is φ = 9071398.

The previous prime is 18142793. The next prime is 18142819. The reversal of 18142798 is 89724181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×18142798² = 658322238537608, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18142798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18142793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4535698 + ... + 4535701.

It is an arithmetic number, because the mean of its divisors is an integer number (6803550).

Almost surely, 2^18142798 is an apocalyptic number.

18142798 is a deficient number, since it is larger than the sum of its proper divisors (9071402).

18142798 is an equidigital number, since it uses as much as digits as its factorization.

18142798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9071401.

The product of its digits is 32256, while the sum is 40.

The square root of 18142798 is about 4259.4363476873. The cubic root of 18142798 is about 262.7653455954.

The spelling of 18142798 in words is "eighteen million, one hundred forty-two thousand, seven hundred ninety-eight".