2158942 has 4 divisors (see below), whose sum is σ = 3238416. Its totient is φ = 1079470.

The previous prime is 2158931. The next prime is 2158979. The reversal of 2158942 is 2498512.

2158942 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 is a super-2 number, since 2×2158942² = 9322061118728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 539734 + ... + 539737.

It is an arithmetic number, because the mean of its divisors is an integer number (809604).

2^2158942 is an apocalyptic number.

2158942 is a deficient number, since it is larger than the sum of its proper divisors (1079474).

2158942 is a wasteful number, since it uses less digits than its factorization.

2158942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079473.

The product of its digits is 5760, while the sum is 31.

The square root of 2158942 is about 1469.3338626738. Note that the first 3 decimals coincide. The cubic root of 2158942 is about 129.2449724745.

The spelling of 2158942 in words is "two million, one hundred fifty-eight thousand, nine hundred forty-two".