853640 has 16 divisors (see below), whose sum is σ = 1920780. Its totient is φ = 341440.

The previous prime is 853637. The next prime is 853663. The reversal of 853640 is 46358.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 68644 = 886^2 + 262^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10631 + ... + 10710.

2⁸⁵³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

853640 is an abundant number, since it is smaller than the sum of its proper divisors (1067140).

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

853640 is a wasteful number, since it uses less digits than its factorization.

853640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21352 (or 21348 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 853640 is about 923.9264039955. The cubic root of 853640 is about 94.8618490570.

Adding to 853640 its reverse (46358), we get a palindrome (899998).

The spelling of 853640 in words is "eight hundred fifty-three thousand, six hundred forty".