9437640721 has 8 divisors (see below), whose sum is σ = 9479393280. Its totient is φ = 9395980992.

The previous prime is 9437640691. The next prime is 9437640743. The reversal of 9437640721 is 1270467349.

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

It is a cyclic number.

It is not a de Polignac number, because 9437640721 - 2¹⁹ = 9437116433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9437649721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184656 + ... + 230158.

It is an arithmetic number, because the mean of its divisors is an integer number (1184924160).

Almost surely, 2^9437640721 is an apocalyptic number.

It is an amenable number.

9437640721 is a deficient number, since it is larger than the sum of its proper divisors (41752559).

9437640721 is a wasteful number, since it uses less digits than its factorization.

9437640721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46415.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 9437640721 is about 97147.5204058240. The cubic root of 9437640721 is about 2113.2675293530.

The spelling of 9437640721 in words is "nine billion, four hundred thirty-seven million, six hundred forty thousand, seven hundred twenty-one".