8434138991 has 8 divisors (see below), whose sum is σ = 9238205520. Its totient is φ = 7664288128.

The previous prime is 8434138963. The next prime is 8434139009. The reversal of 8434138991 is 1998314348.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8434138991 is a prime.

It is a super-2 number, since 2×8434138991² (a number of 21 digits) contains 22 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 (8434131991) 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, 8553401 + ... + 8554386.

It is an arithmetic number, because the mean of its divisors is an integer number (1154775690).

Almost surely, 2^8434138991 is an apocalyptic number.

8434138991 is a deficient number, since it is larger than the sum of its proper divisors (804066529).

8434138991 is a wasteful number, since it uses less digits than its factorization.

8434138991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17107833.

The product of its digits is 746496, while the sum is 50.

The square root of 8434138991 is about 91837.5685163757. The cubic root of 8434138991 is about 2035.5428600406.

The spelling of 8434138991 in words is "eight billion, four hundred thirty-four million, one hundred thirty-eight thousand, nine hundred ninety-one".