18027457 has 4 divisors (see below), whose sum is σ = 20602816. Its totient is φ = 15452100.

The previous prime is 18027439. The next prime is 18027481. The reversal of 18027457 is 75472081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18027457 - 2¹⁵ = 17994689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18021457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287669 + ... + 1287682.

It is an arithmetic number, because the mean of its divisors is an integer number (5150704).

Almost surely, 2^18027457 is an apocalyptic number.

It is an amenable number.

18027457 is a deficient number, since it is larger than the sum of its proper divisors (2575359).

18027457 is an equidigital number, since it uses as much as digits as its factorization.

18027457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575358.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 18027457 is about 4245.8752925634. The cubic root of 18027457 is about 262.2073267165.

The spelling of 18027457 in words is "eighteen million, twenty-seven thousand, four hundred fifty-seven".