9994921 has 4 divisors (see below), whose sum is σ = 10265092. Its totient is φ = 9724752.

The previous prime is 9994913. The next prime is 9994951. The reversal of 9994921 is 1294999.

9994921 = 2235² + 2236².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4999696 + 4995225 = 2236^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 9994921 - 2³ = 9994913 is a prime.

It is a Duffinian number.

9994921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9994951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135030 + ... + 135103.

It is an arithmetic number, because the mean of its divisors is an integer number (2566273).

Almost surely, 2^9994921 is an apocalyptic number.

9994921 is the 2236-th centered square number.

It is an amenable number.

9994921 is a deficient number, since it is larger than the sum of its proper divisors (270171).

9994921 is a wasteful number, since it uses less digits than its factorization.

9994921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270170.

The product of its digits is 52488, while the sum is 43.

The square root of 9994921 is about 3161.4744977621. The cubic root of 9994921 is about 215.4069882470.

The spelling of 9994921 in words is "nine million, nine hundred ninety-four thousand, nine hundred twenty-one".