18457856 has 18 divisors (see below), whose sum is σ = 36844122. Its totient is φ = 9228800.

The previous prime is 18457841. The next prime is 18457861. The reversal of 18457856 is 65875481.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 5382400 = 3616^2 + 2320^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35795 + ... + 36306.

Almost surely, 2^18457856 is an apocalyptic number.

18457856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18457856 is a deficient number, since it is larger than the sum of its proper divisors (18386266).

18457856 is an frugal number, since it uses more digits than its factorization.

18457856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72117 (or 72103 counting only the distinct ones).

The product of its digits is 268800, while the sum is 44.

The square root of 18457856 is about 4296.2606997248. The cubic root of 18457856 is about 264.2776387389.

The spelling of 18457856 in words is "eighteen million, four hundred fifty-seven thousand, eight hundred fifty-six".