856080421 has 24 divisors (see below), whose sum is σ = 1022782464. Its totient is φ = 714067200.

The previous prime is 856080413. The next prime is 856080427. The reversal of 856080421 is 124080658.

856080421 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 856080421 - 2³ = 856080413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856080427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 743196 + ... + 744346.

It is an arithmetic number, because the mean of its divisors is an integer number (42615936).

Almost surely, 2^856080421 is an apocalyptic number.

It is an amenable number.

856080421 is a deficient number, since it is larger than the sum of its proper divisors (166702043).

856080421 is a wasteful number, since it uses less digits than its factorization.

856080421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 856080421 is about 29258.8520109727. The cubic root of 856080421 is about 949.5216136203.

The spelling of 856080421 in words is "eight hundred fifty-six million, eighty thousand, four hundred twenty-one".