1239448747 has 4 divisors (see below), whose sum is σ = 1239519160. Its totient is φ = 1239378336.

The previous prime is 1239448697. The next prime is 1239448757. The reversal of 1239448747 is 7478449321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1239448747 - 2²⁷ = 1105231019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1239448747.

It is not an unprimeable number, because it can be changed into a prime (1239448757) 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, 17428 + ... + 52750.

It is an arithmetic number, because the mean of its divisors is an integer number (309879790).

Almost surely, 2^1239448747 is an apocalyptic number.

1239448747 is a deficient number, since it is larger than the sum of its proper divisors (70413).

1239448747 is an equidigital number, since it uses as much as digits as its factorization.

1239448747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70412.

The product of its digits is 1354752, while the sum is 49.

The square root of 1239448747 is about 35205.8055865790. The cubic root of 1239448747 is about 1074.1778453665.

The spelling of 1239448747 in words is "one billion, two hundred thirty-nine million, four hundred forty-eight thousand, seven hundred forty-seven".