18966457 has 4 divisors (see below), whose sum is σ = 18976036. Its totient is φ = 18956880.

The previous prime is 18966439. The next prime is 18966461. The reversal of 18966457 is 75466981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11215801 + 7750656 = 3349^2 + 2784^2 .

It is a cyclic number.

It is not a de Polignac number, because 18966457 - 2¹⁵ = 18933689 is a prime.

It is a super-2 number, since 2×18966457² = 719452982265698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18966757) 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 in 3 ways as a sum of consecutive naturals, for example, 594 + ... + 6187.

It is an arithmetic number, because the mean of its divisors is an integer number (4744009).

Almost surely, 2^18966457 is an apocalyptic number.

It is an amenable number.

18966457 is a deficient number, since it is larger than the sum of its proper divisors (9579).

18966457 is an equidigital number, since it uses as much as digits as its factorization.

18966457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9578.

The product of its digits is 362880, while the sum is 46.

The square root of 18966457 is about 4355.0495978806. The cubic root of 18966457 is about 266.6830439594.

The spelling of 18966457 in words is "eighteen million, nine hundred sixty-six thousand, four hundred fifty-seven".