18316426 has 4 divisors (see below), whose sum is σ = 27474642. Its totient is φ = 9158212.

The previous prime is 18316411. The next prime is 18316427. The reversal of 18316426 is 62461381.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15610401 + 2706025 = 3951^2 + 1645^2 .

It is a super-2 number, since 2×18316426² = 670982922826952, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (18316427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4579105 + ... + 4579108.

Almost surely, 2^18316426 is an apocalyptic number.

18316426 is a deficient number, since it is larger than the sum of its proper divisors (9158216).

18316426 is an equidigital number, since it uses as much as digits as its factorization.

18316426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9158215.

The product of its digits is 6912, while the sum is 31.

The square root of 18316426 is about 4279.7693863104. The cubic root of 18316426 is about 263.6009140747.

The spelling of 18316426 in words is "eighteen million, three hundred sixteen thousand, four hundred twenty-six".