856451 has 6 divisors (see below), whose sum is σ = 895860. Its totient is φ = 818708.

The previous prime is 856441. The next prime is 856459. The reversal of 856451 is 154658.

It is a happy number.

It is not a de Polignac number, because 856451 - 2¹⁰ = 855427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 281 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (149310).

2⁸⁵⁶⁴⁵¹ is an apocalyptic number.

856451 is a deficient number, since it is larger than the sum of its proper divisors (39409).

856451 is a wasteful number, since it uses less digits than its factorization.

856451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665 (or 1642 counting only the distinct ones).

The product of its digits is 4800, while the sum is 29.

The square root of 856451 is about 925.4463787816. The cubic root of 856451 is about 94.9658603090.

The spelling of 856451 in words is "eight hundred fifty-six thousand, four hundred fifty-one".