138494813 has 4 divisors (see below), whose sum is σ = 138622848. Its totient is φ = 138366780.

The previous prime is 138494803. The next prime is 138494899. The reversal of 138494813 is 318494831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 318494831 = 3389 ⋅93979.

It is a cyclic number.

It is not a de Polignac number, because 138494813 - 2¹⁴ = 138478429 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 (138494803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62381 + ... + 64562.

It is an arithmetic number, because the mean of its divisors is an integer number (34655712).

Almost surely, 2^138494813 is an apocalyptic number.

It is an amenable number.

138494813 is a deficient number, since it is larger than the sum of its proper divisors (128035).

138494813 is a wasteful number, since it uses less digits than its factorization.

138494813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128034.

The product of its digits is 82944, while the sum is 41.

The square root of 138494813 is about 11768.3819193634. The cubic root of 138494813 is about 517.3818261908.

The spelling of 138494813 in words is "one hundred thirty-eight million, four hundred ninety-four thousand, eight hundred thirteen".