1244839 has 2 divisors, whose sum is σ = 1244840. Its totient is φ = 1244838.

The previous prime is 1244833. The next prime is 1244857. The reversal of 1244839 is 9384421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244839 is a prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1244839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622419 + 622420.

It is an arithmetic number, because the mean of its divisors is an integer number (622420).

2^1244839 is an apocalyptic number.

1244839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244839 is an equidigital number, since it uses as much as digits as its factorization.

1244839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 1244839 is about 1115.7235320634. The cubic root of 1244839 is about 107.5732761630.

The spelling of 1244839 in words is "one million, two hundred forty-four thousand, eight hundred thirty-nine".