138967865 has 8 divisors (see below), whose sum is σ = 167183880. Its totient is φ = 110892672.

The previous prime is 138967859. The next prime is 138967883. The reversal of 138967865 is 568769831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6165289 + 132802576 = 2483^2 + 11524^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138967865 - 2¹⁴ = 138951481 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 33020 + ... + 36989.

It is an arithmetic number, because the mean of its divisors is an integer number (20897985).

Almost surely, 2^138967865 is an apocalyptic number.

It is an amenable number.

138967865 is a deficient number, since it is larger than the sum of its proper divisors (28216015).

138967865 is an equidigital number, since it uses as much as digits as its factorization.

138967865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70411.

The product of its digits is 2177280, while the sum is 53.

The square root of 138967865 is about 11788.4632162127. The cubic root of 138967865 is about 517.9702245821.

The spelling of 138967865 in words is "one hundred thirty-eight million, nine hundred sixty-seven thousand, eight hundred sixty-five".