985997421 has 16 divisors (see below), whose sum is σ = 1478339520. Its totient is φ = 649410480.

The previous prime is 985997417. The next prime is 985997429. The reversal of 985997421 is 124799589.

985997421 is a `hidden beast` number, since 9 + 8 + 599 + 7 + 42 + 1 = 666.

It is not a de Polignac number, because 985997421 - 2² = 985997417 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985997429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217750 + ... + 222231.

It is an arithmetic number, because the mean of its divisors is an integer number (92396220).

Almost surely, 2^985997421 is an apocalyptic number.

It is an amenable number.

985997421 is a deficient number, since it is larger than the sum of its proper divisors (492342099).

985997421 is a wasteful number, since it uses less digits than its factorization.

985997421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440073 (or 440067 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 985997421 is about 31400.5958701423. The cubic root of 985997421 is about 995.3105167898.

The spelling of 985997421 in words is "nine hundred eighty-five million, nine hundred ninety-seven thousand, four hundred twenty-one".