852721439 has 2 divisors, whose sum is σ = 852721440. Its totient is φ = 852721438.

The previous prime is 852721427. The next prime is 852721459. The reversal of 852721439 is 934127258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 852721439 - 2²⁸ = 584285983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 852721396 and 852721405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (852721409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426360719 + 426360720.

It is an arithmetic number, because the mean of its divisors is an integer number (426360720).

Almost surely, 2^852721439 is an apocalyptic number.

852721439 is a deficient number, since it is larger than the sum of its proper divisors (1).

852721439 is an equidigital number, since it uses as much as digits as its factorization.

852721439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 852721439 is about 29201.3944701276. The cubic root of 852721439 is about 948.2781141889.

The spelling of 852721439 in words is "eight hundred fifty-two million, seven hundred twenty-one thousand, four hundred thirty-nine".