2991998 has 4 divisors (see below), whose sum is σ = 4488000. Its totient is φ = 1495998.

The previous prime is 2991971. The next prime is 2992007. The reversal of 2991998 is 8991992.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 747998 + ... + 748001.

It is an arithmetic number, because the mean of its divisors is an integer number (1122000).

2^2991998 is an apocalyptic number.

2991998 is a deficient number, since it is larger than the sum of its proper divisors (1496002).

2991998 is a wasteful number, since it uses less digits than its factorization.

2991998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496001.

The product of its digits is 104976, while the sum is 47.

The square root of 2991998 is about 1729.7392867135. The cubic root of 2991998 is about 144.0966108372.

The spelling of 2991998 in words is "two million, nine hundred ninety-one thousand, nine hundred ninety-eight".