5991998 has 4 divisors (see below), whose sum is σ = 8988000. Its totient is φ = 2995998.

The previous prime is 5991991. The next prime is 5992003. The reversal of 5991998 is 8991995.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5991991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1497998 + ... + 1498001.

It is an arithmetic number, because the mean of its divisors is an integer number (2247000).

Almost surely, 2^5991998 is an apocalyptic number.

5991998 is a deficient number, since it is larger than the sum of its proper divisors (2996002).

5991998 is a wasteful number, since it uses less digits than its factorization.

5991998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996001.

The product of its digits is 262440, while the sum is 50.

The square root of 5991998 is about 2447.8557964063. The cubic root of 5991998 is about 181.6312422394.

The spelling of 5991998 in words is "five million, nine hundred ninety-one thousand, nine hundred ninety-eight".