2159998 has 4 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 1079998.

The previous prime is 2159959. The next prime is 2160001. The reversal of 2159998 is 8999512.

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

It is a congruent number.

It is an unprimeable 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, 539998 + ... + 540001.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

2^2159998 is an apocalyptic number.

2159998 is a deficient number, since it is larger than the sum of its proper divisors (1080002).

2159998 is a wasteful number, since it uses less digits than its factorization.

2159998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080001.

The product of its digits is 58320, while the sum is 43.

The square root of 2159998 is about 1469.6931652559. The cubic root of 2159998 is about 129.2660415050.

It can be divided in two parts, 2 and 159998, that added together give a 4-th power (160000 = 20⁴).

The spelling of 2159998 in words is "two million, one hundred fifty-nine thousand, nine hundred ninety-eight".