138279766 has 8 divisors (see below), whose sum is σ = 209433744. Its totient is φ = 68468520.

The previous prime is 138279763. The next prime is 138279769. The reversal of 138279766 is 667972831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138279763) and next prime (138279769).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138279763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335425 + ... + 335836.

It is an arithmetic number, because the mean of its divisors is an integer number (26179218).

Almost surely, 2^138279766 is an apocalyptic number.

138279766 is a deficient number, since it is larger than the sum of its proper divisors (71153978).

138279766 is a wasteful number, since it uses less digits than its factorization.

138279766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671366.

The product of its digits is 762048, while the sum is 49.

The square root of 138279766 is about 11759.2417272544. The cubic root of 138279766 is about 517.1139002814.

The spelling of 138279766 in words is "one hundred thirty-eight million, two hundred seventy-nine thousand, seven hundred sixty-six".