138428236 has 12 divisors (see below), whose sum is σ = 242477928. Its totient is φ = 69148832.

The previous prime is 138428233. The next prime is 138428249. The reversal of 138428236 is 632824831.

It is a junction number, because it is equal to n+sod(n) for n = 138428195 and 138428204.

It is not an unprimeable number, because it can be changed into a prime (138428233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11386 + ... + 20161.

It is an arithmetic number, because the mean of its divisors is an integer number (20206494).

Almost surely, 2^138428236 is an apocalyptic number.

It is an amenable number.

138428236 is a deficient number, since it is larger than the sum of its proper divisors (104049692).

138428236 is a wasteful number, since it uses less digits than its factorization.

138428236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32648 (or 32646 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 138428236 is about 11765.5529406824. The cubic root of 138428236 is about 517.2989079208.

The spelling of 138428236 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, two hundred thirty-six".