999828257 has 2 divisors, whose sum is σ = 999828258. Its totient is φ = 999828256.

The previous prime is 999828163. The next prime is 999828299. The reversal of 999828257 is 752828999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547372816 + 452455441 = 23396^2 + 21271^2 .

It is a cyclic number.

It is not a de Polignac number, because 999828257 - 2¹⁴ = 999811873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999828196 and 999828205.

It is not a weakly prime, because it can be changed into another prime (999828757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499914128 + 499914129.

It is an arithmetic number, because the mean of its divisors is an integer number (499914129).

Almost surely, 2^999828257 is an apocalyptic number.

It is an amenable number.

999828257 is a deficient number, since it is larger than the sum of its proper divisors (1).

999828257 is an equidigital number, since it uses as much as digits as its factorization.

999828257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 59.

The square root of 999828257 is about 31620.0609898210. The cubic root of 999828257 is about 999.9427490557.

The spelling of 999828257 in words is "nine hundred ninety-nine million, eight hundred twenty-eight thousand, two hundred fifty-seven".