138355236 has 48 divisors (see below), whose sum is σ = 364795200. Its totient is φ = 45334656.

The previous prime is 138355229. The next prime is 138355249. The reversal of 138355236 is 632553831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 138355236.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4485 + ... + 17228.

It is an arithmetic number, because the mean of its divisors is an integer number (7599900).

Almost surely, 2^138355236 is an apocalyptic number.

It is an amenable number.

138355236 is an abundant number, since it is smaller than the sum of its proper divisors (226439964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138355236 is a wasteful number, since it uses less digits than its factorization.

138355236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21785 (or 21777 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 138355236 is about 11762.4502549426. The cubic root of 138355236 is about 517.2079595676.

The spelling of 138355236 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, two hundred thirty-six".