1239438828 has 18 divisors (see below), whose sum is σ = 2892308524. Its totient is φ = 413105624.

The previous prime is 1239438817. The next prime is 1239438853. The reversal of 1239438828 is 8288349321.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116875 + ... + 127037.

Almost surely, 2^1239438828 is an apocalyptic number.

It is an amenable number.

1239438828 is an abundant number, since it is smaller than the sum of its proper divisors (1652869696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1239438828 is an frugal number, since it uses more digits than its factorization.

1239438828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20333 (or 10168 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 1239438828 is about 35205.6647146450. The cubic root of 1239438828 is about 1074.1749798995.

Multiplying 1239438828 by its sum of digits (48), we get a square (59493063744 = 243912²).

The spelling of 1239438828 in words is "one billion, two hundred thirty-nine million, four hundred thirty-eight thousand, eight hundred twenty-eight".