789921 has 24 divisors (see below), whose sum is σ = 1272960. Its totient is φ = 468000.

The previous prime is 789883. The next prime is 789941. The reversal of 789921 is 129987.

It is a happy number.

It is not a de Polignac number, because 789921 - 2⁶ = 789857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (789941) 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, 7771 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (53040).

2⁷⁸⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

789921 is a deficient number, since it is larger than the sum of its proper divisors (483039).

789921 is a wasteful number, since it uses less digits than its factorization.

789921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 194 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 789921 is about 888.7749996484. The cubic root of 789921 is about 92.4402731059.

It can be divided in two parts, 78 and 9921, that added together give a palindrome (9999).

The spelling of 789921 in words is "seven hundred eighty-nine thousand, nine hundred twenty-one".