8919813 has 12 divisors (see below), whose sum is σ = 13835040. Its totient is φ = 5096952.

The previous prime is 8919809. The next prime is 8919817. The reversal of 8919813 is 3189198.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8919809) and next prime (8919817).

It is not a de Polignac number, because 8919813 - 2² = 8919809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8919817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30193 + ... + 30486.

It is an arithmetic number, because the mean of its divisors is an integer number (1152920).

Almost surely, 2^8919813 is an apocalyptic number.

It is an amenable number.

8919813 is a deficient number, since it is larger than the sum of its proper divisors (4915227).

8919813 is a wasteful number, since it uses less digits than its factorization.

8919813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60696 (or 60689 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 8919813 is about 2986.6055983340. The cubic root of 8919813 is about 207.3887767023.

The spelling of 8919813 in words is "eight million, nine hundred nineteen thousand, eight hundred thirteen".