138658503 has 4 divisors (see below), whose sum is σ = 184878008. Its totient is φ = 92439000.

The previous prime is 138658469. The next prime is 138658519. The reversal of 138658503 is 305856831.

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

It is not a de Polignac number, because 138658503 - 2¹⁰ = 138657479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138658603) 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, 23109748 + ... + 23109753.

It is an arithmetic number, because the mean of its divisors is an integer number (46219502).

Almost surely, 2^138658503 is an apocalyptic number.

138658503 is a deficient number, since it is larger than the sum of its proper divisors (46219505).

138658503 is an equidigital number, since it uses as much as digits as its factorization.

138658503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46219504.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 138658503 is about 11775.3345175413. The cubic root of 138658503 is about 517.5855808428.

The spelling of 138658503 in words is "one hundred thirty-eight million, six hundred fifty-eight thousand, five hundred three".