2138555 has 4 divisors (see below), whose sum is σ = 2566272. Its totient is φ = 1710840.

The previous prime is 2138551. The next prime is 2138569. The reversal of 2138555 is 5558312.

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

It is not a de Polignac number, because 2138555 - 2² = 2138551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138551) 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, 213851 + ... + 213860.

It is an arithmetic number, because the mean of its divisors is an integer number (641568).

2^2138555 is an apocalyptic number.

2138555 is a deficient number, since it is larger than the sum of its proper divisors (427717).

2138555 is an equidigital number, since it uses as much as digits as its factorization.

2138555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427716.

The product of its digits is 6000, while the sum is 29.

The square root of 2138555 is about 1462.3799095994. The cubic root of 2138555 is about 128.8368628654.

The spelling of 2138555 in words is "two million, one hundred thirty-eight thousand, five hundred fifty-five".