8638132399 has 4 divisors (see below), whose sum is σ = 9302604136. Its totient is φ = 7973660664.

The previous prime is 8638132387. The next prime is 8638132403. The reversal of 8638132399 is 9932318368.

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 8638132399 - 2¹³ = 8638124207 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 (8638132339) 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, 332235849 + ... + 332235874.

It is an arithmetic number, because the mean of its divisors is an integer number (2325651034).

Almost surely, 2^8638132399 is an apocalyptic number.

8638132399 is a deficient number, since it is larger than the sum of its proper divisors (664471737).

8638132399 is a wasteful number, since it uses less digits than its factorization.

8638132399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664471736.

The product of its digits is 1679616, while the sum is 52.

The square root of 8638132399 is about 92941.5536721869. The cubic root of 8638132399 is about 2051.8232756917.

The spelling of 8638132399 in words is "eight billion, six hundred thirty-eight million, one hundred thirty-two thousand, three hundred ninety-nine".