138782606 has 4 divisors (see below), whose sum is σ = 208173912. Its totient is φ = 69391302.

The previous prime is 138782591. The next prime is 138782627. The reversal of 138782606 is 606287831.

It is a happy number.

138782606 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×138782606² = 38521223456302472, which contains 22 as substring.

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, 34695650 + ... + 34695653.

It is an arithmetic number, because the mean of its divisors is an integer number (52043478).

Almost surely, 2^138782606 is an apocalyptic number.

138782606 is a deficient number, since it is larger than the sum of its proper divisors (69391306).

138782606 is an equidigital number, since it uses as much as digits as its factorization.

138782606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69391305.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 138782606 is about 11780.6029557065. The cubic root of 138782606 is about 517.7399523570.

The spelling of 138782606 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, six hundred six".