138900229 has 8 divisors (see below), whose sum is σ = 149709560. Its totient is φ = 128108736.

The previous prime is 138900221. The next prime is 138900247. The reversal of 138900229 is 922009831.

It can be written as a sum of positive squares in 4 ways, for example, as 6880129 + 132020100 = 2623^2 + 11490^2 .

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 138900229 - 2³ = 138900221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138900194 and 138900203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138900221) 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, 14839 + ... + 22315.

It is an arithmetic number, because the mean of its divisors is an integer number (18713695).

Almost surely, 2^138900229 is an apocalyptic number.

It is an amenable number.

138900229 is a deficient number, since it is larger than the sum of its proper divisors (10809331).

138900229 is a wasteful number, since it uses less digits than its factorization.

138900229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8919.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 138900229 is about 11785.5941301234. The cubic root of 138900229 is about 517.8861784868.

It can be divided in two parts, 138900 and 229, that added together give a square (139129 = 373²).

The spelling of 138900229 in words is "one hundred thirty-eight million, nine hundred thousand, two hundred twenty-nine".