138648782 has 4 divisors (see below), whose sum is σ = 207973176. Its totient is φ = 69324390.

The previous prime is 138648779. The next prime is 138648817. The reversal of 138648782 is 287846831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34662194 + ... + 34662197.

It is an arithmetic number, because the mean of its divisors is an integer number (51993294).

Almost surely, 2^138648782 is an apocalyptic number.

138648782 is a deficient number, since it is larger than the sum of its proper divisors (69324394).

138648782 is an equidigital number, since it uses as much as digits as its factorization.

138648782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69324393.

The product of its digits is 516096, while the sum is 47.

The square root of 138648782 is about 11774.9217407166. The cubic root of 138648782 is about 517.5734850177.

The spelling of 138648782 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, seven hundred eighty-two".