18428457 has 4 divisors (see below), whose sum is σ = 24571280. Its totient is φ = 12285636.

The previous prime is 18428441. The next prime is 18428483. The reversal of 18428457 is 75482481.

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 not a de Polignac number, because 18428457 - 2⁴ = 18428441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18428437) 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, 3071407 + ... + 3071412.

It is an arithmetic number, because the mean of its divisors is an integer number (6142820).

Almost surely, 2^18428457 is an apocalyptic number.

It is an amenable number.

18428457 is a deficient number, since it is larger than the sum of its proper divisors (6142823).

18428457 is an equidigital number, since it uses as much as digits as its factorization.

18428457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142822.

The product of its digits is 71680, while the sum is 39.

The square root of 18428457 is about 4292.8378725500. The cubic root of 18428457 is about 264.1372535836.

The spelling of 18428457 in words is "eighteen million, four hundred twenty-eight thousand, four hundred fifty-seven".