1244639 has 4 divisors (see below), whose sum is σ = 1357800. Its totient is φ = 1131480.

The previous prime is 1244629. The next prime is 1244647. The reversal of 1244639 is 9364421.

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 1244639 - 2¹² = 1240543 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 (1244609) 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, 56564 + ... + 56585.

It is an arithmetic number, because the mean of its divisors is an integer number (339450).

2^1244639 is an apocalyptic number.

1244639 is a deficient number, since it is larger than the sum of its proper divisors (113161).

1244639 is a wasteful number, since it uses less digits than its factorization.

1244639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113160.

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

The square root of 1244639 is about 1115.6339005247. The cubic root of 1244639 is about 107.5675148269.

The spelling of 1244639 in words is "one million, two hundred forty-four thousand, six hundred thirty-nine".