2138123 has 4 divisors (see below), whose sum is σ = 2302608. Its totient is φ = 1973640.

The previous prime is 2138093. The next prime is 2138137. The reversal of 2138123 is 3218312.

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

It is a cyclic number.

It is not a de Polignac number, because 2138123 - 2¹⁴ = 2121739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2138095 and 2138104.

It is not an unprimeable number, because it can be changed into a prime (2138623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82223 + ... + 82248.

It is an arithmetic number, because the mean of its divisors is an integer number (575652).

2^2138123 is an apocalyptic number.

2138123 is a deficient number, since it is larger than the sum of its proper divisors (164485).

2138123 is a wasteful number, since it uses less digits than its factorization.

2138123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164484.

The product of its digits is 288, while the sum is 20.

The square root of 2138123 is about 1462.2321977032. The cubic root of 2138123 is about 128.8281870270.

The spelling of 2138123 in words is "two million, one hundred thirty-eight thousand, one hundred twenty-three".