8642439 has 12 divisors (see below), whose sum is σ = 13443976. Its totient is φ = 5318352.

The previous prime is 8642429. The next prime is 8642449. The reversal of 8642439 is 9342468.

It is a happy number.

8642439 is a `hidden beast` number, since 8 + 642 + 4 + 3 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (8642429) and next prime (8642449).

It is not a de Polignac number, because 8642439 - 2¹¹ = 8640391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8642429) 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, 36817 + ... + 37050.

Almost surely, 2^8642439 is an apocalyptic number.

8642439 is a deficient number, since it is larger than the sum of its proper divisors (4801537).

8642439 is a wasteful number, since it uses less digits than its factorization.

8642439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73886 (or 73883 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 8642439 is about 2939.8025443897. The cubic root of 8642439 is about 205.2164202630.

Subtracting from 8642439 its sum of digits (36), we obtain a triangular number (8642403 = T₄₁₅₇).

The spelling of 8642439 in words is "eight million, six hundred forty-two thousand, four hundred thirty-nine".