899857 has 4 divisors (see below), whose sum is σ = 1028416. Its totient is φ = 771300.

The previous prime is 899851. The next prime is 899863. The reversal of 899857 is 758998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758998 = 2 ⋅379499.

It is an interprime number because it is at equal distance from previous prime (899851) and next prime (899863).

It is a cyclic number.

It is not a de Polignac number, because 899857 - 2³ = 899849 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899851) 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 3 ways as a sum of consecutive naturals, for example, 64269 + ... + 64282.

It is an arithmetic number, because the mean of its divisors is an integer number (257104).

2⁸⁹⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

899857 is a deficient number, since it is larger than the sum of its proper divisors (128559).

899857 is a wasteful number, since it uses less digits than its factorization.

899857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128558.

The product of its digits is 181440, while the sum is 46.

The square root of 899857 is about 948.6079274389. The cubic root of 899857 is about 96.5438246719.

Subtracting from 899857 its sum of digits (46), we obtain a triangular number (899811 = T₁₃₄₁).

The spelling of 899857 in words is "eight hundred ninety-nine thousand, eight hundred fifty-seven".