138861755 has 8 divisors (see below), whose sum is σ = 167250624. Its totient is φ = 110678400.

The previous prime is 138861733. The next prime is 138861761. The reversal of 138861755 is 557168831.

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

It is not a de Polignac number, because 138861755 - 2⁶ = 138861691 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49886 + ... + 52595.

It is an arithmetic number, because the mean of its divisors is an integer number (20906328).

Almost surely, 2^138861755 is an apocalyptic number.

138861755 is a deficient number, since it is larger than the sum of its proper divisors (28388869).

138861755 is a wasteful number, since it uses less digits than its factorization.

138861755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102757.

The product of its digits is 201600, while the sum is 44.

The square root of 138861755 is about 11783.9617701349. The cubic root of 138861755 is about 517.8383576086.

The spelling of 138861755 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, seven hundred fifty-five".