834609721 has 24 divisors (see below), whose sum is σ = 934157952. Its totient is φ = 745008000.

The previous prime is 834609707. The next prime is 834609761. The reversal of 834609721 is 127906438.

It is not a de Polignac number, because 834609721 - 2⁵ = 834609689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (834609761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2081121 + ... + 2081521.

It is an arithmetic number, because the mean of its divisors is an integer number (38923248).

Almost surely, 2^834609721 is an apocalyptic number.

It is an amenable number.

834609721 is a deficient number, since it is larger than the sum of its proper divisors (99548231).

834609721 is a wasteful number, since it uses less digits than its factorization.

834609721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 834609721 is about 28889.6126834542. The cubic root of 834609721 is about 941.5162345055.

The spelling of 834609721 in words is "eight hundred thirty-four million, six hundred nine thousand, seven hundred twenty-one".