138236245 has 16 divisors (see below), whose sum is σ = 189940608. Its totient is φ = 94610880.

The previous prime is 138236239. The next prime is 138236249. The reversal of 138236245 is 542632831.

It is not a de Polignac number, because 138236245 - 2³ = 138236237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138236245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138236249) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16527 + ... + 23443.

It is an arithmetic number, because the mean of its divisors is an integer number (11871288).

Almost surely, 2^138236245 is an apocalyptic number.

It is an amenable number.

138236245 is a deficient number, since it is larger than the sum of its proper divisors (51704363).

138236245 is an equidigital number, since it uses as much as digits as its factorization.

138236245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500.

The product of its digits is 34560, while the sum is 34.

The square root of 138236245 is about 11757.3910796571. The cubic root of 138236245 is about 517.0596439089.

The spelling of 138236245 in words is "one hundred thirty-eight million, two hundred thirty-six thousand, two hundred forty-five".