1243245439 has 2 divisors, whose sum is σ = 1243245440. Its totient is φ = 1243245438.

The previous prime is 1243245403. The next prime is 1243245481. The reversal of 1243245439 is 9345423421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243245439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243245398 and 1243245407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243245239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621622719 + 621622720.

It is an arithmetic number, because the mean of its divisors is an integer number (621622720).

Almost surely, 2^1243245439 is an apocalyptic number.

1243245439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243245439 is an equidigital number, since it uses as much as digits as its factorization.

1243245439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 1243245439 is about 35259.6857473234. The cubic root of 1243245439 is about 1075.2735381792.

The spelling of 1243245439 in words is "one billion, two hundred forty-three million, two hundred forty-five thousand, four hundred thirty-nine".