9921959 has 8 divisors (see below), whose sum is σ = 10242960. Its totient is φ = 9604800.

The previous prime is 9921917. The next prime is 9921983. The reversal of 9921959 is 9591299.

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 9921959 - 2¹⁶ = 9856423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921259) 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, 4829 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (1280370).

Almost surely, 2^9921959 is an apocalyptic number.

9921959 is a deficient number, since it is larger than the sum of its proper divisors (321001).

9921959 is a wasteful number, since it uses less digits than its factorization.

9921959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its digits is 65610, while the sum is 44.

The square root of 9921959 is about 3149.9141258136. The cubic root of 9921959 is about 214.8815572609.

The spelling of 9921959 in words is "nine million, nine hundred twenty-one thousand, nine hundred fifty-nine".