998966 has 4 divisors (see below), whose sum is σ = 1498452. Its totient is φ = 499482.

The previous prime is 998957. The next prime is 998969. The reversal of 998966 is 669899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669899 = 41 ⋅16339.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 998966.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 998966.

It is not an unprimeable number, because it can be changed into a prime (998969) by changing a digit.

998966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249740 + ... + 249743.

It is an arithmetic number, because the mean of its divisors is an integer number (374613).

2⁹⁹⁸⁹⁶⁶ is an apocalyptic number.

998966 is a deficient number, since it is larger than the sum of its proper divisors (499486).

998966 is a wasteful number, since it uses less digits than its factorization.

998966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499485.

The product of its digits is 209952, while the sum is 47.

The square root of 998966 is about 999.4828662864. The cubic root of 998966 is about 99.9655214470.

The spelling of 998966 in words is "nine hundred ninety-eight thousand, nine hundred sixty-six".