138505803 has 4 divisors (see below), whose sum is σ = 184674408. Its totient is φ = 92337200.

The previous prime is 138505789. The next prime is 138505823. The reversal of 138505803 is 308505831.

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 138505803 - 2⁵ = 138505771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138505823) 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, 23084298 + ... + 23084303.

It is an arithmetic number, because the mean of its divisors is an integer number (46168602).

Almost surely, 2^138505803 is an apocalyptic number.

138505803 is a deficient number, since it is larger than the sum of its proper divisors (46168605).

138505803 is an equidigital number, since it uses as much as digits as its factorization.

138505803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46168604.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 138505803 is about 11768.8488392026. The cubic root of 138505803 is about 517.3955111218.

The spelling of 138505803 in words is "one hundred thirty-eight million, five hundred five thousand, eight hundred three".