789421057 has 4 divisors (see below), whose sum is σ = 789502896. Its totient is φ = 789339220.

The previous prime is 789421049. The next prime is 789421079. The reversal of 789421057 is 750124987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 750124987 = 79 ⋅9495253.

It is a cyclic number.

It is not a de Polignac number, because 789421057 - 2³ = 789421049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (789427057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24163 + ... + 46504.

It is an arithmetic number, because the mean of its divisors is an integer number (197375724).

Almost surely, 2^789421057 is an apocalyptic number.

It is an amenable number.

789421057 is a deficient number, since it is larger than the sum of its proper divisors (81839).

789421057 is a wasteful number, since it uses less digits than its factorization.

789421057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81838.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 789421057 is about 28096.6378237682. The cubic root of 789421057 is about 924.2076709591.

The spelling of 789421057 in words is "seven hundred eighty-nine million, four hundred twenty-one thousand, fifty-seven".