9920919 has 16 divisors (see below), whose sum is σ = 13586400. Its totient is φ = 6437376.

The previous prime is 9920903. The next prime is 9920923. The reversal of 9920919 is 9190299.

It is a happy number.

It is not a de Polignac number, because 9920919 - 2⁴ = 9920903 is a prime.

It is a super-2 number, since 2×9920919² = 196849267609122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9920219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19237 + ... + 19745.

It is an arithmetic number, because the mean of its divisors is an integer number (849150).

Almost surely, 2^9920919 is an apocalyptic number.

9920919 is a deficient number, since it is larger than the sum of its proper divisors (3665481).

9920919 is a wasteful number, since it uses less digits than its factorization.

9920919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 9920919 is about 3149.7490376219. The cubic root of 9920919 is about 214.8740491795.

The spelling of 9920919 in words is "nine million, nine hundred twenty thousand, nine hundred nineteen".