138245903 has 4 divisors (see below), whose sum is σ = 141460968. Its totient is φ = 135030840.

The previous prime is 138245869. The next prime is 138245959. The reversal of 138245903 is 309542831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138245903 - 2²⁴ = 121468687 is a prime.

It is a super-2 number, since 2×138245903² = 38223859392570818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138245963) 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, 1607468 + ... + 1607553.

It is an arithmetic number, because the mean of its divisors is an integer number (35365242).

Almost surely, 2^138245903 is an apocalyptic number.

138245903 is a deficient number, since it is larger than the sum of its proper divisors (3215065).

138245903 is an equidigital number, since it uses as much as digits as its factorization.

138245903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215064.

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

The square root of 138245903 is about 11757.8017928523. The cubic root of 138245903 is about 517.0716852413.

The spelling of 138245903 in words is "one hundred thirty-eight million, two hundred forty-five thousand, nine hundred three".