851445 has 64 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 359424.

The previous prime is 851423. The next prime is 851449. The reversal of 851445 is 544158.

851445 = T₇₀ + T₇₁ + ... + T₁₇₅.

It is not a de Polignac number, because 851445 - 2⁵ = 851413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851449) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16039 + ... + 16091.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2⁸⁵¹⁴⁴⁵ is an apocalyptic number.

851445 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

851445 is an abundant number, since it is smaller than the sum of its proper divisors (1014795).

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

851445 is a wasteful number, since it uses less digits than its factorization.

851445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 85 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 851445 is about 922.7377742349. The cubic root of 851445 is about 94.7804718629.

It can be divided in two parts, 851 and 445, that added together give a 4-th power (1296 = 6⁴).

The spelling of 851445 in words is "eight hundred fifty-one thousand, four hundred forty-five".