138900705 has 16 divisors (see below), whose sum is σ = 222399744. Its totient is φ = 74027520.

The previous prime is 138900673. The next prime is 138900709. The reversal of 138900705 is 507009831.

It is not a de Polignac number, because 138900705 - 2⁵ = 138900673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138900709) 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 15 ways as a sum of consecutive naturals, for example, 27960 + ... + 32550.

It is an arithmetic number, because the mean of its divisors is an integer number (13899984).

Almost surely, 2^138900705 is an apocalyptic number.

138900705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138900705 is a deficient number, since it is larger than the sum of its proper divisors (83499039).

138900705 is a wasteful number, since it uses less digits than its factorization.

138900705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 138900705 is about 11785.6143242514. The cubic root of 138900705 is about 517.8867700710.

The spelling of 138900705 in words is "one hundred thirty-eight million, nine hundred thousand, seven hundred five".