2138238 has 40 divisors (see below), whose sum is σ = 4887432. Its totient is φ = 698544.

The previous prime is 2138231. The next prime is 2138239. The reversal of 2138238 is 8328312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10756 + ... + 10952.

2^2138238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2443716).

2138238 is an abundant number, since it is smaller than the sum of its proper divisors (2749194).

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

2138238 is a wasteful number, since it uses less digits than its factorization.

2138238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 269 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 2138238 is about 1462.2715206144. The cubic root of 2138238 is about 128.8304966814.

The spelling of 2138238 in words is "two million, one hundred thirty-eight thousand, two hundred thirty-eight".