18143457 has 8 divisors (see below), whose sum is σ = 24706176. Its totient is φ = 11838192.

The previous prime is 18143453. The next prime is 18143459. The reversal of 18143457 is 75434181.

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

It is not a de Polignac number, because 18143457 - 2² = 18143453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18143453) 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 7 ways as a sum of consecutive naturals, for example, 64198 + ... + 64479.

It is an arithmetic number, because the mean of its divisors is an integer number (3088272).

Almost surely, 2^18143457 is an apocalyptic number.

It is an amenable number.

18143457 is a deficient number, since it is larger than the sum of its proper divisors (6562719).

18143457 is a wasteful number, since it uses less digits than its factorization.

18143457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128727.

The product of its digits is 13440, while the sum is 33.

The square root of 18143457 is about 4259.5137046381. The cubic root of 18143457 is about 262.7685270280.

The spelling of 18143457 in words is "eighteen million, one hundred forty-three thousand, four hundred fifty-seven".