138113806 has 4 divisors (see below), whose sum is σ = 207170712. Its totient is φ = 69056902.

The previous prime is 138113803. The next prime is 138113861. The reversal of 138113806 is 608311831.

138113806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608311831 = 2609 ⋅233159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138113803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34528450 + ... + 34528453.

It is an arithmetic number, because the mean of its divisors is an integer number (51792678).

Almost surely, 2^138113806 is an apocalyptic number.

138113806 is a deficient number, since it is larger than the sum of its proper divisors (69056906).

138113806 is an equidigital number, since it uses as much as digits as its factorization.

138113806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69056905.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 138113806 is about 11752.1830312500. The cubic root of 138113806 is about 516.9069416367.

The spelling of 138113806 in words is "one hundred thirty-eight million, one hundred thirteen thousand, eight hundred six".