872640239 has 2 divisors, whose sum is σ = 872640240. Its totient is φ = 872640238.

The previous prime is 872640233. The next prime is 872640257. The reversal of 872640239 is 932046278.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 872640239 - 2²⁰ = 871591663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 872640196 and 872640205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (872640233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436320119 + 436320120.

It is an arithmetic number, because the mean of its divisors is an integer number (436320120).

Almost surely, 2^872640239 is an apocalyptic number.

872640239 is a deficient number, since it is larger than the sum of its proper divisors (1).

872640239 is an equidigital number, since it uses as much as digits as its factorization.

872640239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 872640239 is about 29540.4847455149. The cubic root of 872640239 is about 955.6049962556.

The spelling of 872640239 in words is "eight hundred seventy-two million, six hundred forty thousand, two hundred thirty-nine".