2138506 has 8 divisors (see below), whose sum is σ = 3255840. Its totient is φ = 1053228.

The previous prime is 2138503. The next prime is 2138527. The reversal of 2138506 is 6058312.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (2138501) 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 3 ways as a sum of consecutive naturals, for example, 7846 + ... + 8113.

It is an arithmetic number, because the mean of its divisors is an integer number (406980).

2^2138506 is an apocalyptic number.

2138506 is a deficient number, since it is larger than the sum of its proper divisors (1117334).

2138506 is a wasteful number, since it uses less digits than its factorization.

2138506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16028.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2138506 is about 1462.3631559910. The cubic root of 2138506 is about 128.8358788592.

The spelling of 2138506 in words is "two million, one hundred thirty-eight thousand, five hundred six".