851740 has 24 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 331200.

The previous prime is 851731. The next prime is 851749. The reversal of 851740 is 47158.

851740 = T₅₄ + T₅₅ + ... + T₁₇₃.

It is an interprime number because it is at equal distance from previous prime (851731) and next prime (851749).

It is a super-2 number, since 2×851740² = 1450922055200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2⁸⁵¹⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919296).

851740 is an abundant number, since it is smaller than the sum of its proper divisors (986852).

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

851740 is a wasteful number, since it uses less digits than its factorization.

851740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 851740 is about 922.8976107890. The cubic root of 851740 is about 94.7914167901.

Adding to 851740 its reverse (47158), we get a palindrome (898898).

The spelling of 851740 in words is "eight hundred fifty-one thousand, seven hundred forty".