2118438 has 96 divisors (see below), whose sum is σ = 5930496. Its totient is φ = 532224.

The previous prime is 2118437. The next prime is 2118449. The reversal of 2118438 is 8348112.

2118438 = 267² + 268² + ... + 293².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118433) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49245 + ... + 49287.

It is an arithmetic number, because the mean of its divisors is an integer number (61776).

2^2118438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2965248).

2118438 is an abundant number, since it is smaller than the sum of its proper divisors (3812058).

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

2118438 is a wasteful number, since it uses less digits than its factorization.

2118438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 95 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 2118438 is about 1455.4854860149. The cubic root of 2118438 is about 128.4316077891.

It can be divided in two parts, 2118 and 438, that added together give a triangular number (2556 = T₇₁).

The spelling of 2118438 in words is "two million, one hundred eighteen thousand, four hundred thirty-eight".