2155138 has 16 divisors (see below), whose sum is σ = 3348864. Its totient is φ = 1039600.

The previous prime is 2155133. The next prime is 2155159. The reversal of 2155138 is 8315512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2155133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9381 + ... + 9607.

It is an arithmetic number, because the mean of its divisors is an integer number (209304).

2^2155138 is an apocalyptic number.

2155138 is a deficient number, since it is larger than the sum of its proper divisors (1193726).

2155138 is a wasteful number, since it uses less digits than its factorization.

2155138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377.

The product of its digits is 1200, while the sum is 25.

The square root of 2155138 is about 1468.0388278244. The cubic root of 2155138 is about 129.1690190808.

The spelling of 2155138 in words is "two million, one hundred fifty-five thousand, one hundred thirty-eight".