8442729 has 12 divisors (see below), whose sum is σ = 12220416. Its totient is φ = 5616792.

The previous prime is 8442713. The next prime is 8442767. The reversal of 8442729 is 9272448.

It is not a de Polignac number, because 8442729 - 2⁴ = 8442713 is a prime.

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 Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8442693 and 8442702.

It is not an unprimeable number, because it can be changed into a prime (8442769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7224 + ... + 8310.

It is an arithmetic number, because the mean of its divisors is an integer number (1018368).

Almost surely, 2^8442729 is an apocalyptic number.

It is an amenable number.

8442729 is a deficient number, since it is larger than the sum of its proper divisors (3777687).

8442729 is a wasteful number, since it uses less digits than its factorization.

8442729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1953 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 8442729 is about 2905.6374515758. The cubic root of 8442729 is about 203.6233679368.

The spelling of 8442729 in words is "eight million, four hundred forty-two thousand, seven hundred twenty-nine".