18430857 has 12 divisors (see below), whose sum is σ = 26872560. Its totient is φ = 12171768.

The previous prime is 18430849. The next prime is 18430861. The reversal of 18430857 is 75803481.

It is not a de Polignac number, because 18430857 - 2³ = 18430849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18430807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8607 + ... + 10532.

It is an arithmetic number, because the mean of its divisors is an integer number (2239380).

Almost surely, 2^18430857 is an apocalyptic number.

It is an amenable number.

18430857 is a deficient number, since it is larger than the sum of its proper divisors (8441703).

18430857 is a wasteful number, since it uses less digits than its factorization.

18430857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19252 (or 19249 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 18430857 is about 4293.1173988141. The cubic root of 18430857 is about 264.1487195805.

The spelling of 18430857 in words is "eighteen million, four hundred thirty thousand, eight hundred fifty-seven".