998977943 has 2 divisors, whose sum is σ = 998977944. Its totient is φ = 998977942.

The previous prime is 998977939. The next prime is 998977961. The reversal of 998977943 is 349779899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998977943 - 2² = 998977939 is a prime.

It is a super-2 number, since 2×998977943² = 1995913861201022498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 998977943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998977643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499488971 + 499488972.

It is an arithmetic number, because the mean of its divisors is an integer number (499488972).

Almost surely, 2^998977943 is an apocalyptic number.

998977943 is a deficient number, since it is larger than the sum of its proper divisors (1).

998977943 is an equidigital number, since it uses as much as digits as its factorization.

998977943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30862944, while the sum is 65.

The square root of 998977943 is about 31606.6123303337. The cubic root of 998977943 is about 999.6591982007.

The spelling of 998977943 in words is "nine hundred ninety-eight million, nine hundred seventy-seven thousand, nine hundred forty-three".