138038779 has 4 divisors (see below), whose sum is σ = 138071160. Its totient is φ = 138006400.

The previous prime is 138038777. The next prime is 138038783. The reversal of 138038779 is 977830831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138038779 - 2¹ = 138038777 is a prime.

It is a super-3 number, since 3×138038779³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138038773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8614 + ... + 18715.

It is an arithmetic number, because the mean of its divisors is an integer number (34517790).

Almost surely, 2^138038779 is an apocalyptic number.

138038779 is a deficient number, since it is larger than the sum of its proper divisors (32381).

138038779 is an equidigital number, since it uses as much as digits as its factorization.

138038779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 138038779 is about 11748.9905523836. The cubic root of 138038779 is about 516.8133255992.

The spelling of 138038779 in words is "one hundred thirty-eight million, thirty-eight thousand, seven hundred seventy-nine".