2159858 has 4 divisors (see below), whose sum is σ = 3239790. Its totient is φ = 1079928.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159858 is 8589512.

2159858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 2093809 + 66049 = 1447^2 + 257^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539963 + ... + 539966.

2^2159858 is an apocalyptic number.

2159858 is a deficient number, since it is larger than the sum of its proper divisors (1079932).

2159858 is a wasteful number, since it uses less digits than its factorization.

2159858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079931.

The product of its digits is 28800, while the sum is 38.

The square root of 2159858 is about 1469.6455354949. The cubic root of 2159858 is about 129.2632486572.

The spelling of 2159858 in words is "two million, one hundred fifty-nine thousand, eight hundred fifty-eight".