9918943 has 4 divisors (see below), whose sum is σ = 9926208. Its totient is φ = 9911680.

The previous prime is 9918941. The next prime is 9918949. The reversal of 9918943 is 3498199.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3498199 = 79 ⋅44281.

It is a cyclic number.

It is not a de Polignac number, because 9918943 - 2¹ = 9918941 is a prime.

It is a Duffinian number.

9918943 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9918943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918941) 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, 898 + ... + 4543.

It is an arithmetic number, because the mean of its divisors is an integer number (2481552).

Almost surely, 2^9918943 is an apocalyptic number.

9918943 is a deficient number, since it is larger than the sum of its proper divisors (7265).

9918943 is a wasteful number, since it uses less digits than its factorization.

9918943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264.

The product of its digits is 69984, while the sum is 43.

The square root of 9918943 is about 3149.4353462168. The cubic root of 9918943 is about 214.8597823791.

The spelling of 9918943 in words is "nine million, nine hundred eighteen thousand, nine hundred forty-three".