8447742 has 48 divisors (see below), whose sum is σ = 20414160. Its totient is φ = 2509056.

The previous prime is 8447731. The next prime is 8447743. The reversal of 8447742 is 2477448.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 8⁵ + 4⁵ + 4⁶ + 7³ + 7⁵ + 4⁶ + 2²³ .

It is a junction number, because it is equal to n+sod(n) for n = 8447697 and 8447706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8447743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5088 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (425295).

Almost surely, 2^8447742 is an apocalyptic number.

It is a pronic number, being equal to 2906×2907.

It is a practical number, because each smaller number is the sum of distinct divisors of 8447742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10207080).

8447742 is an abundant number, since it is smaller than the sum of its proper divisors (11966418).

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

8447742 is a wasteful number, since it uses less digits than its factorization.

8447742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497 (or 1494 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 8447742 is about 2906.4999569929. The cubic root of 8447742 is about 203.6636614635.

The spelling of 8447742 in words is "eight million, four hundred forty-seven thousand, seven hundred forty-two".