9721894 has 36 divisors (see below), whose sum is σ = 18400284. Its totient is φ = 3839472.

The previous prime is 9721891. The next prime is 9721897. The reversal of 9721894 is 4981279.

It is an interprime number because it is at equal distance from previous prime (9721891) and next prime (9721897).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721891) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16269 + ... + 16855.

It is an arithmetic number, because the mean of its divisors is an integer number (511119).

Almost surely, 2^9721894 is an apocalyptic number.

9721894 is a deficient number, since it is larger than the sum of its proper divisors (8678390).

9721894 is a wasteful number, since it uses less digits than its factorization.

9721894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 609 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 9721894 is about 3117.9951892202. The cubic root of 9721894 is about 213.4274590069.

The spelling of 9721894 in words is "nine million, seven hundred twenty-one thousand, eight hundred ninety-four".