18232078 has 4 divisors (see below), whose sum is σ = 27348120. Its totient is φ = 9116038.

The previous prime is 18232073. The next prime is 18232079. The reversal of 18232078 is 87023281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87023281 = 263 ⋅330887.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18232073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4558018 + ... + 4558021.

It is an arithmetic number, because the mean of its divisors is an integer number (6837030).

Almost surely, 2^18232078 is an apocalyptic number.

18232078 is a deficient number, since it is larger than the sum of its proper divisors (9116042).

18232078 is an equidigital number, since it uses as much as digits as its factorization.

18232078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116041.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18232078 is about 4269.9037459877. The cubic root of 18232078 is about 263.1956598447.

The spelling of 18232078 in words is "eighteen million, two hundred thirty-two thousand, seventy-eight".