859915421 has 12 divisors (see below), whose sum is σ = 901148892. Its totient is φ = 820497216.

The previous prime is 859915393. The next prime is 859915477. The reversal of 859915421 is 124519958.

It can be written as a sum of positive squares in 2 ways, for example, as 421850521 + 438064900 = 20539^2 + 20930^2 .

It is not a de Polignac number, because 859915421 - 2²⁶ = 792806557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859915921) 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 11 ways as a sum of consecutive naturals, for example, 239975 + ... + 243531.

It is an arithmetic number, because the mean of its divisors is an integer number (75095741).

Almost surely, 2^859915421 is an apocalyptic number.

It is an amenable number.

859915421 is a deficient number, since it is larger than the sum of its proper divisors (41233471).

859915421 is a wasteful number, since it uses less digits than its factorization.

859915421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060 (or 4037 counting only the distinct ones).

The product of its digits is 129600, while the sum is 44.

The square root of 859915421 is about 29324.3145017919. The cubic root of 859915421 is about 950.9373651023.

The spelling of 859915421 in words is "eight hundred fifty-nine million, nine hundred fifteen thousand, four hundred twenty-one".