1998279 has 12 divisors (see below), whose sum is σ = 2901600. Its totient is φ = 1325184.

The previous prime is 1998277. The next prime is 1998289. The reversal of 1998279 is 9728991.

It is not a de Polignac number, because 1998279 - 2¹ = 1998277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1687 + ... + 2615.

It is an arithmetic number, because the mean of its divisors is an integer number (241800).

2^1998279 is an apocalyptic number.

1998279 is a deficient number, since it is larger than the sum of its proper divisors (903321).

1998279 is a wasteful number, since it uses less digits than its factorization.

1998279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174 (or 1171 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1998279 is about 1413.6049660354. The cubic root of 1998279 is about 125.9559558833.

The spelling of 1998279 in words is "one million, nine hundred ninety-eight thousand, two hundred seventy-nine".