8640129 has 8 divisors (see below), whose sum is σ = 11831680. Its totient is φ = 5604336.

The previous prime is 8640109. The next prime is 8640133. The reversal of 8640129 is 9210468.

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

It is not a de Polignac number, because 8640129 - 2⁷ = 8640001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8640096 and 8640105.

It is not an unprimeable number, because it can be changed into a prime (8640109) 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, 38809 + ... + 39030.

It is an arithmetic number, because the mean of its divisors is an integer number (1478960).

Almost surely, 2^8640129 is an apocalyptic number.

It is an amenable number.

8640129 is a deficient number, since it is larger than the sum of its proper divisors (3191551).

8640129 is a wasteful number, since it uses less digits than its factorization.

8640129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77879.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 8640129 is about 2939.4096346035. The cubic root of 8640129 is about 205.1981348318.

The spelling of 8640129 in words is "eight million, six hundred forty thousand, one hundred twenty-nine".