851420 has 12 divisors (see below), whose sum is σ = 1788024. Its totient is φ = 340560.

The previous prime is 851419. The next prime is 851423. The reversal of 851420 is 24158.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 42571 = 851420 / (8 + 5 + 1 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 851392 and 851401.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851420.

It is not an unprimeable number, because it can be changed into a prime (851423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21266 + ... + 21305.

It is an arithmetic number, because the mean of its divisors is an integer number (149002).

2⁸⁵¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

851420 is an abundant number, since it is smaller than the sum of its proper divisors (936604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851420 is a wasteful number, since it uses less digits than its factorization.

851420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42580 (or 42578 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 851420 is about 922.7242274916. The cubic root of 851420 is about 94.7795442105.

Adding to 851420 its reverse (24158), we get a palindrome (875578).

The spelling of 851420 in words is "eight hundred fifty-one thousand, four hundred twenty".