85140405 has 24 divisors (see below), whose sum is σ = 168659712. Its totient is φ = 38921184.

The previous prime is 85140401. The next prime is 85140421. The reversal of 85140405 is 50404158.

It is not a de Polignac number, because 85140405 - 2² = 85140401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85140401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134829 + ... + 135458.

It is an arithmetic number, because the mean of its divisors is an integer number (7027488).

Almost surely, 2^85140405 is an apocalyptic number.

It is an amenable number.

85140405 is a deficient number, since it is larger than the sum of its proper divisors (83519307).

85140405 is a wasteful number, since it uses less digits than its factorization.

85140405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270305 (or 270302 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 85140405 is about 9227.1558456547. The cubic root of 85140405 is about 439.9249269300.

The spelling of 85140405 in words is "eighty-five million, one hundred forty thousand, four hundred five".