2138440 has 32 divisors (see below), whose sum is σ = 4853880. Its totient is φ = 847872.

The previous prime is 2138429. The next prime is 2138467. The reversal of 2138440 is 448312.

It can be written as a sum of positive squares in 4 ways, for example, as 1085764 + 1052676 = 1042^2 + 1026^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7582 + ... + 7858.

2^2138440 is an apocalyptic number.

2138440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2138440 is an abundant number, since it is smaller than the sum of its proper divisors (2715440).

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

2138440 is a wasteful number, since it uses less digits than its factorization.

2138440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 2138440 is about 1462.3405896028. The cubic root of 2138440 is about 128.8345534392.

The spelling of 2138440 in words is "two million, one hundred thirty-eight thousand, four hundred forty".