9721837 has 2 divisors, whose sum is σ = 9721838. Its totient is φ = 9721836.

The previous prime is 9721823. The next prime is 9721849. The reversal of 9721837 is 7381279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7322436 + 2399401 = 2706^2 + 1549^2 .

It is an emirp because it is prime and its reverse (7381279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9721837 - 2¹⁹ = 9197549 is a prime.

It is a super-2 number, since 2×9721837² = 189028229309138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9721796 and 9721805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9721867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860918 + 4860919.

It is an arithmetic number, because the mean of its divisors is an integer number (4860919).

Almost surely, 2^9721837 is an apocalyptic number.

It is an amenable number.

9721837 is a deficient number, since it is larger than the sum of its proper divisors (1).

9721837 is an equidigital number, since it uses as much as digits as its factorization.

9721837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 9721837 is about 3117.9860487180. The cubic root of 9721837 is about 213.4270418937.

It can be divided in two parts, 972 and 1837, that added together give a square (2809 = 53²).

The spelling of 9721837 in words is "nine million, seven hundred twenty-one thousand, eight hundred thirty-seven".