985729921 has 8 divisors (see below), whose sum is σ = 1138597344. Its totient is φ = 843405120.

The previous prime is 985729907. The next prime is 985729939. The reversal of 985729921 is 129927589.

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

It is a cyclic number.

It is not a de Polignac number, because 985729921 - 2¹⁹ = 985205633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985729021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2635455 + ... + 2635828.

It is an arithmetic number, because the mean of its divisors is an integer number (142324668).

Almost surely, 2^985729921 is an apocalyptic number.

It is an amenable number.

985729921 is a deficient number, since it is larger than the sum of its proper divisors (152867423).

985729921 is a wasteful number, since it uses less digits than its factorization.

985729921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271311.

The product of its digits is 816480, while the sum is 52.

The square root of 985729921 is about 31396.3361078964. The cubic root of 985729921 is about 995.2204997713.

The spelling of 985729921 in words is "nine hundred eighty-five million, seven hundred twenty-nine thousand, nine hundred twenty-one".