138967305 has 16 divisors (see below), whose sum is σ = 223065600. Its totient is φ = 73876608.

The previous prime is 138967303. The next prime is 138967319. The reversal of 138967305 is 503769831.

It is not a de Polignac number, because 138967305 - 2¹ = 138967303 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138967303) 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, 10105 + ... + 19494.

It is an arithmetic number, because the mean of its divisors is an integer number (13941600).

Almost surely, 2^138967305 is an apocalyptic number.

138967305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138967305 is a deficient number, since it is larger than the sum of its proper divisors (84098295).

138967305 is a wasteful number, since it uses less digits than its factorization.

138967305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29920.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 138967305 is about 11788.4394641530. The cubic root of 138967305 is about 517.9695288248.

The spelling of 138967305 in words is "one hundred thirty-eight million, nine hundred sixty-seven thousand, three hundred five".