1998079 has 8 divisors (see below), whose sum is σ = 2106720. Its totient is φ = 1891296.

The previous prime is 1998077. The next prime is 1998089. The reversal of 1998079 is 9708991.

1998079 = 135² + 136² + ... + 203².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1998079 - 2¹ = 1998077 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998077) 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 in 7 ways as a sum of consecutive naturals, for example, 2109 + ... + 2905.

It is an arithmetic number, because the mean of its divisors is an integer number (263340).

2^1998079 is an apocalyptic number.

1998079 is a deficient number, since it is larger than the sum of its proper divisors (108641).

1998079 is a wasteful number, since it uses less digits than its factorization.

1998079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1998079 is about 1413.5342231442. The cubic root of 1998079 is about 125.9517535953.

The spelling of 1998079 in words is "one million, nine hundred ninety-eight thousand, seventy-nine".