2156442 has 8 divisors (see below), whose sum is σ = 4312896. Its totient is φ = 718812.

The previous prime is 2156437. The next prime is 2156447. The reversal of 2156442 is 2446512.

2156442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2156437) and next prime (2156447).

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

2156442 is an admirable number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2156447) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 179698 + ... + 179709.

It is an arithmetic number, because the mean of its divisors is an integer number (539112).

2^2156442 is an apocalyptic number.

2156442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156442 is a wasteful number, since it uses less digits than its factorization.

2156442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359412.

The product of its digits is 1920, while the sum is 24.

The square root of 2156442 is about 1468.4828906051. The cubic root of 2156442 is about 129.1950657408.

The spelling of 2156442 in words is "two million, one hundred fifty-six thousand, four hundred forty-two".