2144639 has 4 divisors (see below), whose sum is σ = 2451024. Its totient is φ = 1838256.

The previous prime is 2144629. The next prime is 2144641. The reversal of 2144639 is 9364412.

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

It is not a de Polignac number, because 2144639 - 2⁸ = 2144383 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 4 + 4² + 6⁶ + 3⁶ + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2144609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153182 + ... + 153195.

It is an arithmetic number, because the mean of its divisors is an integer number (612756).

2^2144639 is an apocalyptic number.

2144639 is a deficient number, since it is larger than the sum of its proper divisors (306385).

2144639 is an equidigital number, since it uses as much as digits as its factorization.

2144639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306384.

The product of its digits is 5184, while the sum is 29.

The square root of 2144639 is about 1464.4586030339. The cubic root of 2144639 is about 128.9589236844.

The spelling of 2144639 in words is "two million, one hundred forty-four thousand, six hundred thirty-nine".