963920721 has 8 divisors (see below), whose sum is σ = 1285425504. Its totient is φ = 642514880.

The previous prime is 963920717. The next prime is 963920773. The reversal of 963920721 is 127029369.

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 963920721 - 2² = 963920717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 963920721.

It is not an unprimeable number, because it can be changed into a prime (963920021) 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, 2185 + ... + 43961.

It is an arithmetic number, because the mean of its divisors is an integer number (160678188).

Almost surely, 2^963920721 is an apocalyptic number.

It is an amenable number.

963920721 is a deficient number, since it is larger than the sum of its proper divisors (321504783).

963920721 is a wasteful number, since it uses less digits than its factorization.

963920721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49471.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 963920721 is about 31047.0726639405. The cubic root of 963920721 is about 987.8259680383.

The spelling of 963920721 in words is "nine hundred sixty-three million, nine hundred twenty thousand, seven hundred twenty-one".