8440138247 has 8 divisors (see below), whose sum is σ = 8548756800. Its totient is φ = 8331564384.

The previous prime is 8440138237. The next prime is 8440138253. The reversal of 8440138247 is 7428310448.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8440138247 - 2⁶ = 8440138183 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 (8440138237) 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, 545129 + ... + 560397.

It is an arithmetic number, because the mean of its divisors is an integer number (1068594600).

Almost surely, 2^8440138247 is an apocalyptic number.

8440138247 is a deficient number, since it is larger than the sum of its proper divisors (108618553).

8440138247 is a wasteful number, since it uses less digits than its factorization.

8440138247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22345.

The product of its (nonzero) digits is 172032, while the sum is 41.

The square root of 8440138247 is about 91870.2250296580. The cubic root of 8440138247 is about 2036.0253771236.

The spelling of 8440138247 in words is "eight billion, four hundred forty million, one hundred thirty-eight thousand, two hundred forty-seven".