85439429 has 2 divisors, whose sum is σ = 85439430. Its totient is φ = 85439428.

The previous prime is 85439383. The next prime is 85439479. The reversal of 85439429 is 92493458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66863329 + 18576100 = 8177^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 85439429 - 2¹² = 85435333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85439429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85439479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719714 + 42719715.

It is an arithmetic number, because the mean of its divisors is an integer number (42719715).

Almost surely, 2^85439429 is an apocalyptic number.

It is an amenable number.

85439429 is a deficient number, since it is larger than the sum of its proper divisors (1).

85439429 is an equidigital number, since it uses as much as digits as its factorization.

85439429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 85439429 is about 9243.3451195982. The cubic root of 85439429 is about 440.4393493774.

The spelling of 85439429 in words is "eighty-five million, four hundred thirty-nine thousand, four hundred twenty-nine".