1998479 has 4 divisors (see below), whose sum is σ = 2283984. Its totient is φ = 1712976.

The previous prime is 1998473. The next prime is 1998497. The reversal of 1998479 is 9748991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998479 - 2⁸ = 1998223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142742 + ... + 142755.

It is an arithmetic number, because the mean of its divisors is an integer number (570996).

2^1998479 is an apocalyptic number.

1998479 is a deficient number, since it is larger than the sum of its proper divisors (285505).

1998479 is an equidigital number, since it uses as much as digits as its factorization.

1998479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285504.

The product of its digits is 163296, while the sum is 47.

The square root of 1998479 is about 1413.6757053865. The cubic root of 1998479 is about 125.9601578909.

The spelling of 1998479 in words is "one million, nine hundred ninety-eight thousand, four hundred seventy-nine".