2187439 has 4 divisors (see below), whose sum is σ = 2218320. Its totient is φ = 2156560.

The previous prime is 2187421. The next prime is 2187457. The reversal of 2187439 is 9347812.

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

It is an interprime number because it is at equal distance from previous prime (2187421) and next prime (2187457).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2187439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185439) 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, 15334 + ... + 15475.

It is an arithmetic number, because the mean of its divisors is an integer number (554580).

2^2187439 is an apocalyptic number.

2187439 is a deficient number, since it is larger than the sum of its proper divisors (30881).

2187439 is an equidigital number, since it uses as much as digits as its factorization.

2187439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30880.

The product of its digits is 12096, while the sum is 34.

The square root of 2187439 is about 1478.9993238673. Note that the first 3 decimals coincide. The cubic root of 2187439 is about 129.8111458983.

The spelling of 2187439 in words is "two million, one hundred eighty-seven thousand, four hundred thirty-nine".