85309421 has 8 divisors (see below), whose sum is σ = 85958400. Its totient is φ = 84663360.

The previous prime is 85309409. The next prime is 85309459. The reversal of 85309421 is 12490358.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85309421 is a prime.

It is a super-2 number, since 2×85309421² = 14555394622710482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85309121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115070 + ... + 115808.

It is an arithmetic number, because the mean of its divisors is an integer number (10744800).

Almost surely, 2^85309421 is an apocalyptic number.

It is an amenable number.

85309421 is a deficient number, since it is larger than the sum of its proper divisors (648979).

85309421 is a wasteful number, since it uses less digits than its factorization.

85309421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 85309421 is about 9236.3099233406. The cubic root of 85309421 is about 440.2158393519.

Adding to 85309421 its reverse (12490358), we get a palindrome (97799779).

The spelling of 85309421 in words is "eighty-five million, three hundred nine thousand, four hundred twenty-one".