850440721 has 8 divisors (see below), whose sum is σ = 916819904. Its totient is φ = 784198800.

The previous prime is 850440707. The next prime is 850440727. The reversal of 850440721 is 127044058.

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 850440721 - 2⁷ = 850440593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (850440727) 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, 21255 + ... + 46396.

It is an arithmetic number, because the mean of its divisors is an integer number (114602488).

Almost surely, 2^850440721 is an apocalyptic number.

It is an amenable number.

850440721 is a deficient number, since it is larger than the sum of its proper divisors (66379183).

850440721 is a wasteful number, since it uses less digits than its factorization.

850440721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68631.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 850440721 is about 29162.3167975386. The cubic root of 850440721 is about 947.4319269395.

Adding to 850440721 its reverse (127044058), we get a palindrome (977484779).

The spelling of 850440721 in words is "eight hundred fifty million, four hundred forty thousand, seven hundred twenty-one".