138503249 has 4 divisors (see below), whose sum is σ = 138532080. Its totient is φ = 138474420.

The previous prime is 138503243. The next prime is 138503251. The reversal of 138503249 is 942305831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138503249 - 2⁸ = 138502993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138503243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5279 + ... + 17460.

It is an arithmetic number, because the mean of its divisors is an integer number (34633020).

Almost surely, 2^138503249 is an apocalyptic number.

It is an amenable number.

138503249 is a deficient number, since it is larger than the sum of its proper divisors (28831).

138503249 is an equidigital number, since it uses as much as digits as its factorization.

138503249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28830.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 138503249 is about 11768.7403319132. The cubic root of 138503249 is about 517.3923309030.

The spelling of 138503249 in words is "one hundred thirty-eight million, five hundred three thousand, two hundred forty-nine".