851340 has 48 divisors (see below), whose sum is σ = 2725632. Its totient is φ = 194496.

The previous prime is 851327. The next prime is 851351. The reversal of 851340 is 43158.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594 + ... + 1433.

It is an arithmetic number, because the mean of its divisors is an integer number (56784).

2⁸⁵¹³⁴⁰ is an apocalyptic number.

It is an amenable number.

851340 is an abundant number, since it is smaller than the sum of its proper divisors (1874292).

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

851340 is a wasteful number, since it uses less digits than its factorization.

851340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 851340 is about 922.6808765765. The cubic root of 851340 is about 94.7765756008.

Subtracting from 851340 its product of nonzero digits (480), we obtain a triangular number (850860 = T₁₃₀₄).

Adding to 851340 its reverse (43158), we get a palindrome (894498).

The spelling of 851340 in words is "eight hundred fifty-one thousand, three hundred forty".