138866149 has 8 divisors (see below), whose sum is σ = 147146328. Its totient is φ = 130598400.

The previous prime is 138866141. The next prime is 138866159. The reversal of 138866149 is 941668831.

It can be written as a sum of positive squares in 4 ways, for example, as 13089924 + 125776225 = 3618^2 + 11215^2 .

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 138866149 - 2³ = 138866141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138866099 and 138866108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138866141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30169 + ... + 34465.

It is an arithmetic number, because the mean of its divisors is an integer number (18393291).

Almost surely, 2^138866149 is an apocalyptic number.

It is an amenable number.

138866149 is a deficient number, since it is larger than the sum of its proper divisors (8280179).

138866149 is a wasteful number, since it uses less digits than its factorization.

138866149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6215.

The product of its digits is 248832, while the sum is 46.

The square root of 138866149 is about 11784.1482085045. The cubic root of 138866149 is about 517.8438195342.

The spelling of 138866149 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, one hundred forty-nine".