85392409 has 2 divisors, whose sum is σ = 85392410. Its totient is φ = 85392408.

The previous prime is 85392397. The next prime is 85392427. The reversal of 85392409 is 90429358.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64048009 + 21344400 = 8003^2 + 4620^2 .

It is a cyclic number.

It is not a de Polignac number, because 85392409 - 2⁹ = 85391897 is a prime.

It is not a weakly prime, because it can be changed into another prime (85392449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42696204 + 42696205.

It is an arithmetic number, because the mean of its divisors is an integer number (42696205).

Almost surely, 2^85392409 is an apocalyptic number.

It is an amenable number.

85392409 is a deficient number, since it is larger than the sum of its proper divisors (1).

85392409 is an equidigital number, since it uses as much as digits as its factorization.

85392409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 85392409 is about 9240.8013180676. The cubic root of 85392409 is about 440.3585386844.

The spelling of 85392409 in words is "eighty-five million, three hundred ninety-two thousand, four hundred nine".