998957 has 2 divisors, whose sum is σ = 998958. Its totient is φ = 998956.

The previous prime is 998951. The next prime is 998969. The reversal of 998957 is 759899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 249001 = 866^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 998957 - 2⁴ = 998941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499478 + 499479.

It is an arithmetic number, because the mean of its divisors is an integer number (499479).

2⁹⁹⁸⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

998957 is a deficient number, since it is larger than the sum of its proper divisors (1).

998957 is an equidigital number, since it uses as much as digits as its factorization.

998957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 998957 is about 999.4783639479. The cubic root of 998957 is about 99.9652212391.

The spelling of 998957 in words is "nine hundred ninety-eight thousand, nine hundred fifty-seven".