8138507447 has 4 divisors (see below), whose sum is σ = 9301151376. Its totient is φ = 6975863520.

The previous prime is 8138507437. The next prime is 8138507449. The reversal of 8138507447 is 7447058318.

It is a happy number.

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 8138507447 - 2²⁴ = 8121730231 is a prime.

It is a super-3 number, since 3×8138507447³ (a number of 31 digits) contains 333 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 (8138507449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581321954 + ... + 581321967.

It is an arithmetic number, because the mean of its divisors is an integer number (2325287844).

Almost surely, 2^8138507447 is an apocalyptic number.

8138507447 is a deficient number, since it is larger than the sum of its proper divisors (1162643929).

8138507447 is a wasteful number, since it uses less digits than its factorization.

8138507447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162643928.

The product of its (nonzero) digits is 752640, while the sum is 47.

The square root of 8138507447 is about 90213.6766072639. The cubic root of 8138507447 is about 2011.4763084641.

The spelling of 8138507447 in words is "eight billion, one hundred thirty-eight million, five hundred seven thousand, four hundred forty-seven".