9918644 has 6 divisors (see below), whose sum is σ = 17357634. Its totient is φ = 4959320.

The previous prime is 9918641. The next prime is 9918647. The reversal of 9918644 is 4468199.

9918644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9918641) and next prime (9918647).

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 3467044 = 2540^2 + 1862^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9918641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239827 + ... + 1239834.

It is an arithmetic number, because the mean of its divisors is an integer number (2892939).

Almost surely, 2^9918644 is an apocalyptic number.

It is an amenable number.

9918644 is a deficient number, since it is larger than the sum of its proper divisors (7438990).

9918644 is a wasteful number, since it uses less digits than its factorization.

9918644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479665 (or 2479663 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 9918644 is about 3149.3878770326. The cubic root of 9918644 is about 214.8576234219.

The spelling of 9918644 in words is "nine million, nine hundred eighteen thousand, six hundred forty-four".