9919864 has 8 divisors (see below), whose sum is σ = 18599760. Its totient is φ = 4959928.

The previous prime is 9919853. The next prime is 9919883. The reversal of 9919864 is 4689199.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×9919864³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619984 + ... + 619999.

It is an arithmetic number, because the mean of its divisors is an integer number (2324970).

Almost surely, 2^9919864 is an apocalyptic number.

It is an amenable number.

9919864 is a deficient number, since it is larger than the sum of its proper divisors (8679896).

9919864 is a wasteful number, since it uses less digits than its factorization.

9919864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239989 (or 1239985 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 9919864 is about 3149.5815595091. The cubic root of 9919864 is about 214.8664322723.

The spelling of 9919864 in words is "nine million, nine hundred nineteen thousand, eight hundred sixty-four".