18470857 has 6 divisors (see below), whose sum is σ = 19621598. Its totient is φ = 17384064.

The previous prime is 18470843. The next prime is 18470873. The reversal of 18470857 is 75807481.

It can be written as a sum of positive squares in 3 ways, for example, as 8128201 + 10342656 = 2851^2 + 3216^2 .

It is not a de Polignac number, because 18470857 - 2¹⁵ = 18438089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18470827) 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, 31668 + ... + 32245.

Almost surely, 2^18470857 is an apocalyptic number.

18470857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18470857 is a deficient number, since it is larger than the sum of its proper divisors (1150741).

18470857 is an equidigital number, since it uses as much as digits as its factorization.

18470857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63947 (or 63930 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18470857 is about 4297.7734933335. The cubic root of 18470857 is about 264.3396731594.

The spelling of 18470857 in words is "eighteen million, four hundred seventy thousand, eight hundred fifty-seven".