85423889 has 2 divisors, whose sum is σ = 85423890. Its totient is φ = 85423888.

The previous prime is 85423873. The next prime is 85423901. The reversal of 85423889 is 98832458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 14190289 = 8440^2 + 3767^2 .

It is a cyclic number.

It is not a de Polignac number, because 85423889 - 2⁴ = 85423873 is a prime.

It is not a weakly prime, because it can be changed into another prime (85423859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42711944 + 42711945.

It is an arithmetic number, because the mean of its divisors is an integer number (42711945).

Almost surely, 2^85423889 is an apocalyptic number.

It is an amenable number.

85423889 is a deficient number, since it is larger than the sum of its proper divisors (1).

85423889 is an equidigital number, since it uses as much as digits as its factorization.

85423889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 47.

The square root of 85423889 is about 9242.5044766016. The cubic root of 85423889 is about 440.4126449133.

The spelling of 85423889 in words is "eighty-five million, four hundred twenty-three thousand, eight hundred eighty-nine".