940707721 has 4 divisors (see below), whose sum is σ = 966132292. Its totient is φ = 915283152.

The previous prime is 940707707. The next prime is 940707737. The reversal of 940707721 is 127707049.

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 518199696 + 422508025 = 22764^2 + 20555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-940707721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 25424533 = 940707721 / (9 + 4 + 0 + 7 + 0 + 7 + 7 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (940767721) 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, 12712230 + ... + 12712303.

It is an arithmetic number, because the mean of its divisors is an integer number (241533073).

Almost surely, 2^940707721 is an apocalyptic number.

It is an amenable number.

940707721 is a deficient number, since it is larger than the sum of its proper divisors (25424571).

940707721 is a wasteful number, since it uses less digits than its factorization.

940707721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25424570.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 940707721 is about 30670.9589188209. The cubic root of 940707721 is about 979.8318887673.

The spelling of 940707721 in words is "nine hundred forty million, seven hundred seven thousand, seven hundred twenty-one".