1998607 has 4 divisors (see below), whose sum is σ = 2152360. Its totient is φ = 1844856.

The previous prime is 1998589. The next prime is 1998611. The reversal of 1998607 is 7068991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7068991 = 17 ⋅415823.

It is not a de Polignac number, because 1998607 - 2¹¹ = 1996559 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1998607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998617) 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, 76857 + ... + 76882.

It is an arithmetic number, because the mean of its divisors is an integer number (538090).

2^1998607 is an apocalyptic number.

1998607 is a deficient number, since it is larger than the sum of its proper divisors (153753).

1998607 is a wasteful number, since it uses less digits than its factorization.

1998607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153752.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1998607 is about 1413.7209767136. The cubic root of 1998607 is about 125.9628470287.

The spelling of 1998607 in words is "one million, nine hundred ninety-eight thousand, six hundred seven".