9726821945 has 8 divisors (see below), whose sum is σ = 11723157960. Its totient is φ = 7747476480.

The previous prime is 9726821933. The next prime is 9726821957. The reversal of 9726821945 is 5491286279.

It is an interprime number because it is at equal distance from previous prime (9726821933) and next prime (9726821957).

It can be written as a sum of positive squares in 4 ways, for example, as 1705111849 + 8021710096 = 41293^2 + 89564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-9726821945 is a prime.

It is a super-2 number, since 2×9726821945² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4246376 + ... + 4248665.

It is an arithmetic number, because the mean of its divisors is an integer number (1465394745).

Almost surely, 2^9726821945 is an apocalyptic number.

It is an amenable number.

9726821945 is a deficient number, since it is larger than the sum of its proper divisors (1996336015).

9726821945 is a wasteful number, since it uses less digits than its factorization.

9726821945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495275.

The product of its digits is 2177280, while the sum is 53.

The square root of 9726821945 is about 98624.6518118062. The cubic root of 9726821945 is about 2134.6351443392.

The spelling of 9726821945 in words is "nine billion, seven hundred twenty-six million, eight hundred twenty-one thousand, nine hundred forty-five".