138954685 has 8 divisors (see below), whose sum is σ = 176554296. Its totient is φ = 104624640.

The previous prime is 138954677. The next prime is 138954691. The reversal of 138954685 is 586459831.

It can be written as a sum of positive squares in 4 ways, for example, as 3790809 + 135163876 = 1947^2 + 11626^2 .

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

It is not a de Polignac number, because 138954685 - 2³ = 138954677 is a prime.

It is a Duffinian number.

It is a congruent 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, 817296 + ... + 817465.

It is an arithmetic number, because the mean of its divisors is an integer number (22069287).

Almost surely, 2^138954685 is an apocalyptic number.

It is an amenable number.

138954685 is a deficient number, since it is larger than the sum of its proper divisors (37599611).

138954685 is a wasteful number, since it uses less digits than its factorization.

138954685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634783.

The product of its digits is 1036800, while the sum is 49.

The square root of 138954685 is about 11787.9041818298. The cubic root of 138954685 is about 517.9538489416.

The spelling of 138954685 in words is "one hundred thirty-eight million, nine hundred fifty-four thousand, six hundred eighty-five".