999257 has 6 divisors (see below), whose sum is σ = 1162458. Its totient is φ = 856464.

The previous prime is 999239. The next prime is 999269. The reversal of 999257 is 752999.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 132496 = 931^2 + 364^2 .

It is a de Polignac number, because none of the positive numbers 2^k-999257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999217) 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, 10148 + ... + 10245.

It is an arithmetic number, because the mean of its divisors is an integer number (193743).

2⁹⁹⁹²⁵⁷ is an apocalyptic number.

It is an amenable number.

999257 is a deficient number, since it is larger than the sum of its proper divisors (163201).

999257 is a wasteful number, since it uses less digits than its factorization.

999257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20407 (or 20400 counting only the distinct ones).

The product of its digits is 51030, while the sum is 41.

The square root of 999257 is about 999.6284309682. The cubic root of 999257 is about 99.9752271969.

The spelling of 999257 in words is "nine hundred ninety-nine thousand, two hundred fifty-seven".