8447139400 has 144 divisors (see below), whose sum is σ = 22901592240. Its totient is φ = 2889129600.

The previous prime is 8447139359. The next prime is 8447139403. The reversal of 8447139400 is 49317448.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (8447139403) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5516635 + ... + 5518165.

It is an arithmetic number, because the mean of its divisors is an integer number (159038835).

Almost surely, 2^8447139400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8447139400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11450796120).

8447139400 is an abundant number, since it is smaller than the sum of its proper divisors (14454452840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8447139400 is a wasteful number, since it uses less digits than its factorization.

8447139400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124 (or 2108 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 8447139400 is about 91908.3206244135. The cubic root of 8447139400 is about 2036.5881872406.

The spelling of 8447139400 in words is "eight billion, four hundred forty-seven million, one hundred thirty-nine thousand, four hundred".