1998967 has 4 divisors (see below), whose sum is σ = 2013696. Its totient is φ = 1984240.

The previous prime is 1998961. The next prime is 1998977. The reversal of 1998967 is 7698991.

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 1998967 - 2⁷ = 1998839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1998967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7159 + ... + 7432.

It is an arithmetic number, because the mean of its divisors is an integer number (503424).

2^1998967 is an apocalyptic number.

1998967 is a deficient number, since it is larger than the sum of its proper divisors (14729).

1998967 is a wasteful number, since it uses less digits than its factorization.

1998967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14728.

The product of its digits is 244944, while the sum is 49.

The square root of 1998967 is about 1413.8482945493. The cubic root of 1998967 is about 125.9704096131.

The spelling of 1998967 in words is "one million, nine hundred ninety-eight thousand, nine hundred sixty-seven".