985905431 has 24 divisors (see below), whose sum is σ = 1224743040. Its totient is φ = 789566400.

The previous prime is 985905413. The next prime is 985905439. The reversal of 985905431 is 134509589.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-985905431 is a prime.

It is a super-2 number, since 2×985905431² = 1944019037750591522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985905439) 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 23 ways as a sum of consecutive naturals, for example, 32861 + ... + 55241.

It is an arithmetic number, because the mean of its divisors is an integer number (51030960).

Almost surely, 2^985905431 is an apocalyptic number.

985905431 is a deficient number, since it is larger than the sum of its proper divisors (238837609).

985905431 is a wasteful number, since it uses less digits than its factorization.

985905431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22455 (or 22448 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 985905431 is about 31399.1310548556. The cubic root of 985905431 is about 995.2795628677.

The spelling of 985905431 in words is "nine hundred eighty-five million, nine hundred five thousand, four hundred thirty-one".