1338891684 has 144 divisors (see below), whose sum is σ = 3507275520. Its totient is φ = 397163520.

The previous prime is 1338891683. The next prime is 1338891689. The reversal of 1338891684 is 4861988331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338891683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9772864 + ... + 9773000.

It is an arithmetic number, because the mean of its divisors is an integer number (24356080).

Almost surely, 2^1338891684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1338891684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1753637760).

1338891684 is an abundant number, since it is smaller than the sum of its proper divisors (2168383836).

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

1338891684 is a wasteful number, since it uses less digits than its factorization.

1338891684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 295 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 1338891684 is about 36590.8688609604. The cubic root of 1338891684 is about 1102.1697350440.

The spelling of 1338891684 in words is "one billion, three hundred thirty-eight million, eight hundred ninety-one thousand, six hundred eighty-four".