998649279 has 12 divisors (see below), whose sum is σ = 1473185376. Its totient is φ = 651600672.

The previous prime is 998649269. The next prime is 998649371. The reversal of 998649279 is 972946899.

It is not a de Polignac number, because 998649279 - 2⁴ = 998649263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998649229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1180014 + ... + 1180859.

It is an arithmetic number, because the mean of its divisors is an integer number (122765448).

Almost surely, 2^998649279 is an apocalyptic number.

998649279 is a deficient number, since it is larger than the sum of its proper divisors (474536097).

998649279 is a wasteful number, since it uses less digits than its factorization.

998649279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360926 (or 2360923 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 998649279 is about 31601.4126108312. The cubic root of 998649279 is about 999.5495567981.

The spelling of 998649279 in words is "nine hundred ninety-eight million, six hundred forty-nine thousand, two hundred seventy-nine".