1144639 has 4 divisors (see below), whose sum is σ = 1155856. Its totient is φ = 1133424.

The previous prime is 1144621. The next prime is 1144643. The reversal of 1144639 is 9364411.

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

It is a cyclic number.

It is not a de Polignac number, because 1144639 - 2⁵ = 1144607 is a prime.

It is a Duffinian number.

1144639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144139) 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, 5454 + ... + 5659.

It is an arithmetic number, because the mean of its divisors is an integer number (288964).

2^1144639 is an apocalyptic number.

1144639 is a deficient number, since it is larger than the sum of its proper divisors (11217).

1144639 is a wasteful number, since it uses less digits than its factorization.

1144639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11216.

The product of its digits is 2592, while the sum is 28.

The square root of 1144639 is about 1069.8780304315. The cubic root of 1144639 is about 104.6058998338.

It can be divided in two parts, 114 and 4639, that added together give a triangular number (4753 = T₉₇).

The spelling of 1144639 in words is "one million, one hundred forty-four thousand, six hundred thirty-nine".