18493857 has 6 divisors (see below), whose sum is σ = 26713362. Its totient is φ = 12329232.

The previous prime is 18493823. The next prime is 18493877. The reversal of 18493857 is 75839481.

It can be written as a sum of positive squares in only one way, i.e., 16966161 + 1527696 = 4119^2 + 1236^2 .

It is not a de Polignac number, because 18493857 - 2¹⁶ = 18428321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18493877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1027428 + ... + 1027445.

It is an arithmetic number, because the mean of its divisors is an integer number (4452227).

Almost surely, 2^18493857 is an apocalyptic number.

It is an amenable number.

18493857 is a deficient number, since it is larger than the sum of its proper divisors (8219505).

18493857 is a wasteful number, since it uses less digits than its factorization.

18493857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054879 (or 2054876 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 18493857 is about 4300.4484649859. The cubic root of 18493857 is about 264.4493466609.

The spelling of 18493857 in words is "eighteen million, four hundred ninety-three thousand, eight hundred fifty-seven".