138820007 has 4 divisors (see below), whose sum is σ = 138860400. Its totient is φ = 138779616.

The previous prime is 138819991. The next prime is 138820009. The reversal of 138820007 is 700028831.

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 138820007 - 2⁴ = 138819991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138820009) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 14507 + ... + 22092.

It is an arithmetic number, because the mean of its divisors is an integer number (34715100).

Almost surely, 2^138820007 is an apocalyptic number.

138820007 is a deficient number, since it is larger than the sum of its proper divisors (40393).

138820007 is an equidigital number, since it uses as much as digits as its factorization.

138820007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40392.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 138820007 is about 11782.1902462997. The cubic root of 138820007 is about 517.7864573508.

Adding to 138820007 its reverse (700028831), we get a palindrome (838848838).

The spelling of 138820007 in words is "one hundred thirty-eight million, eight hundred twenty thousand, seven".