85440389 has 2 divisors, whose sum is σ = 85440390. Its totient is φ = 85440388.

The previous prime is 85440379. The next prime is 85440403. The reversal of 85440389 is 98304458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68973025 + 16467364 = 8305^2 + 4058^2 .

It is a cyclic number.

It is not a de Polignac number, because 85440389 - 2⁸ = 85440133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85440379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42720194 + 42720195.

It is an arithmetic number, because the mean of its divisors is an integer number (42720195).

Almost surely, 2^85440389 is an apocalyptic number.

It is an amenable number.

85440389 is a deficient number, since it is larger than the sum of its proper divisors (1).

85440389 is an equidigital number, since it uses as much as digits as its factorization.

85440389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 85440389 is about 9243.3970487046. The cubic root of 85440389 is about 440.4409989678.

The spelling of 85440389 in words is "eighty-five million, four hundred forty thousand, three hundred eighty-nine".