9765394021 has 4 divisors (see below), whose sum is σ = 9789270700. Its totient is φ = 9741517344.

The previous prime is 9765394003. The next prime is 9765394049. The reversal of 9765394021 is 1204935679.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7554043396 + 2211350625 = 86914^2 + 47025^2 .

It is a cyclic number.

It is not a de Polignac number, because 9765394021 - 2⁷ = 9765393893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9765394061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11937726 + ... + 11938543.

It is an arithmetic number, because the mean of its divisors is an integer number (2447317675).

Almost surely, 2^9765394021 is an apocalyptic number.

It is an amenable number.

9765394021 is a deficient number, since it is larger than the sum of its proper divisors (23876679).

9765394021 is a wasteful number, since it uses less digits than its factorization.

9765394021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23876678.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 9765394021 is about 98820.0082017807. The cubic root of 9765394021 is about 2137.4530812222.

The spelling of 9765394021 in words is "nine billion, seven hundred sixty-five million, three hundred ninety-four thousand, twenty-one".