9725215385 has 8 divisors (see below), whose sum is σ = 11715669576. Its totient is φ = 7749898240.

The previous prime is 9725215319. The next prime is 9725215391. The reversal of 9725215385 is 5835125279.

9725215385 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3278249536 + 6446965849 = 57256^2 + 80293^2 .

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

It is not a de Polignac number, because 9725215385 - 2²² = 9721021081 is a prime.

It is a Duffinian number.

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, 3782846 + ... + 3785415.

It is an arithmetic number, because the mean of its divisors is an integer number (1464458697).

Almost surely, 2^9725215385 is an apocalyptic number.

It is an amenable number.

9725215385 is a deficient number, since it is larger than the sum of its proper divisors (1990454191).

9725215385 is a wasteful number, since it uses less digits than its factorization.

9725215385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7568523.

The product of its digits is 756000, while the sum is 47.

The square root of 9725215385 is about 98616.5066558332. The cubic root of 9725215385 is about 2134.5176133757.

The spelling of 9725215385 in words is "nine billion, seven hundred twenty-five million, two hundred fifteen thousand, three hundred eighty-five".