2155442 has 4 divisors (see below), whose sum is σ = 3233166. Its totient is φ = 1077720.

The previous prime is 2155429. The next prime is 2155451. The reversal of 2155442 is 2445512.

It is a happy number.

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., 2076481 + 78961 = 1441^2 + 281^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538859 + ... + 538862.

2^2155442 is an apocalyptic number.

2155442 is a deficient number, since it is larger than the sum of its proper divisors (1077724).

2155442 is a wasteful number, since it uses less digits than its factorization.

2155442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077723.

The product of its digits is 1600, while the sum is 23.

The square root of 2155442 is about 1468.1423636691. The cubic root of 2155442 is about 129.1750922472.

The spelling of 2155442 in words is "two million, one hundred fifty-five thousand, four hundred forty-two".