9996621 has 4 divisors (see below), whose sum is σ = 13328832. Its totient is φ = 6664412.

The previous prime is 9996617. The next prime is 9996631. The reversal of 9996621 is 1266999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9996621 - 2² = 9996617 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9996631) 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, 1666101 + ... + 1666106.

It is an arithmetic number, because the mean of its divisors is an integer number (3332208).

Almost surely, 2^9996621 is an apocalyptic number.

It is an amenable number.

9996621 is a deficient number, since it is larger than the sum of its proper divisors (3332211).

9996621 is a wasteful number, since it uses less digits than its factorization.

9996621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332210.

The product of its digits is 52488, while the sum is 42.

The square root of 9996621 is about 3161.7433482179. The cubic root of 9996621 is about 215.4192001534.

The spelling of 9996621 in words is "nine million, nine hundred ninety-six thousand, six hundred twenty-one".