18459457 has 4 divisors (see below), whose sum is σ = 19096020. Its totient is φ = 17822896.

The previous prime is 18459407. The next prime is 18459473. The reversal of 18459457 is 75495481.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8116801 + 10342656 = 2849^2 + 3216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18459457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18459407) 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, 318238 + ... + 318295.

It is an arithmetic number, because the mean of its divisors is an integer number (4774005).

Almost surely, 2^18459457 is an apocalyptic number.

It is an amenable number.

18459457 is a deficient number, since it is larger than the sum of its proper divisors (636563).

18459457 is an equidigital number, since it uses as much as digits as its factorization.

18459457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636562.

The product of its digits is 201600, while the sum is 43.

The square root of 18459457 is about 4296.4470205043. The cubic root of 18459457 is about 264.2852795012.

The spelling of 18459457 in words is "eighteen million, four hundred fifty-nine thousand, four hundred fifty-seven".