984923721 has 6 divisors (see below), whose sum is σ = 1422667610. Its totient is φ = 656615808.

The previous prime is 984923701. The next prime is 984923789. The reversal of 984923721 is 127329489.

984923721 is a `hidden beast` number, since 98 + 492 + 3 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 934158096 + 50765625 = 30564^2 + 7125^2 .

It is not a de Polignac number, because 984923721 - 2⁷ = 984923593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (984923701) 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 5 ways as a sum of consecutive naturals, for example, 54717976 + ... + 54717993.

Almost surely, 2^984923721 is an apocalyptic number.

It is an amenable number.

984923721 is a deficient number, since it is larger than the sum of its proper divisors (437743889).

984923721 is a wasteful number, since it uses less digits than its factorization.

984923721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109435975 (or 109435972 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 984923721 is about 31383.4944039060. The cubic root of 984923721 is about 994.9491050792.

The spelling of 984923721 in words is "nine hundred eighty-four million, nine hundred twenty-three thousand, seven hundred twenty-one".