138351805 has 16 divisors (see below), whose sum is σ = 167814144. Its totient is φ = 109494720.

The previous prime is 138351803. The next prime is 138351809. The reversal of 138351805 is 508153831.

It is not a de Polignac number, because 138351805 - 2¹ = 138351803 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 (138351803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264274 + ... + 264796.

It is an arithmetic number, because the mean of its divisors is an integer number (10488384).

Almost surely, 2^138351805 is an apocalyptic number.

It is an amenable number.

138351805 is a deficient number, since it is larger than the sum of its proper divisors (29462339).

138351805 is a wasteful number, since it uses less digits than its factorization.

138351805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 138351805 is about 11762.3044085757. The cubic root of 138351805 is about 517.2036842080.

The spelling of 138351805 in words is "one hundred thirty-eight million, three hundred fifty-one thousand, eight hundred five".