18028426 has 8 divisors (see below), whose sum is σ = 29122884. Its totient is φ = 8320800.

The previous prime is 18028411. The next prime is 18028429. The reversal of 18028426 is 62482081.

It can be written as a sum of positive squares in 2 ways, for example, as 15610401 + 2418025 = 3951^2 + 1555^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18028429) 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 in 3 ways as a sum of consecutive naturals, for example, 346675 + ... + 346726.

Almost surely, 2^18028426 is an apocalyptic number.

18028426 is a deficient number, since it is larger than the sum of its proper divisors (11094458).

18028426 is a wasteful number, since it uses less digits than its factorization.

18028426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693416.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18028426 is about 4245.9894017767. The cubic root of 18028426 is about 262.2120246308.

The spelling of 18028426 in words is "eighteen million, twenty-eight thousand, four hundred twenty-six".