8991388239 has 8 divisors (see below), whose sum is σ = 12140271360. Its totient is φ = 5918381976.

The previous prime is 8991388171. The next prime is 8991388253. The reversal of 8991388239 is 9328831998.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8991388239 - 2²⁹ = 8454517327 is a prime.

It is a super-2 number, since 2×8991388239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991388039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18968937 + ... + 18969410.

It is an arithmetic number, because the mean of its divisors is an integer number (1517533920).

Almost surely, 2^8991388239 is an apocalyptic number.

8991388239 is a deficient number, since it is larger than the sum of its proper divisors (3148883121).

8991388239 is a wasteful number, since it uses less digits than its factorization.

8991388239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37938429.

The product of its digits is 6718464, while the sum is 60.

The square root of 8991388239 is about 94822.9309766367. The cubic root of 8991388239 is about 2079.4201600420.

The spelling of 8991388239 in words is "eight billion, nine hundred ninety-one million, three hundred eighty-eight thousand, two hundred thirty-nine".