2091998 has 8 divisors (see below), whose sum is σ = 3155880. Its totient is φ = 1040040.

The previous prime is 2091997. The next prime is 2092019. The reversal of 2091998 is 8991902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528 + ... + 3251.

It is an arithmetic number, because the mean of its divisors is an integer number (394485).

2^2091998 is an apocalyptic number.

2091998 is a deficient number, since it is larger than the sum of its proper divisors (1063882).

2091998 is a wasteful number, since it uses less digits than its factorization.

2091998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5962.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 2091998 is about 1446.3740871573. The cubic root of 2091998 is about 127.8950555834.

The spelling of 2091998 in words is "two million, ninety-one thousand, nine hundred ninety-eight".