1998715 has 8 divisors (see below), whose sum is σ = 2422368. Its totient is φ = 1583040.

The previous prime is 1998701. The next prime is 1998727. The reversal of 1998715 is 5178991.

It is a happy number.

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

It is not a de Polignac number, because 1998715 - 2⁷ = 1998587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1426 + ... + 2455.

It is an arithmetic number, because the mean of its divisors is an integer number (302796).

2^1998715 is an apocalyptic number.

1998715 is a deficient number, since it is larger than the sum of its proper divisors (423653).

1998715 is a wasteful number, since it uses less digits than its factorization.

1998715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3989.

The product of its digits is 22680, while the sum is 40.

The square root of 1998715 is about 1413.7591732682. The cubic root of 1998715 is about 125.9651158993.

It can be divided in two parts, 19987 and 15, that added together give a palindrome (20002).

The spelling of 1998715 in words is "one million, nine hundred ninety-eight thousand, seven hundred fifteen".