813140 has 24 divisors (see below), whose sum is σ = 1727880. Its totient is φ = 321408.

The previous prime is 813133. The next prime is 813157. The reversal of 813140 is 41318.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 150544 + 662596 = 388^2 + 814^2 .

It is a super-2 number, since 2×813140² = 1322393319200, which contains 22 as substring.

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 813140.

It is an unprimeable number.

813140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994 + ... + 2366.

It is an arithmetic number, because the mean of its divisors is an integer number (71995).

2⁸¹³¹⁴⁰ is an apocalyptic number.

It is an amenable number.

813140 is an abundant number, since it is smaller than the sum of its proper divisors (914740).

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

813140 is a wasteful number, since it uses less digits than its factorization.

813140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 813140 is about 901.7427571098. The cubic root of 813140 is about 93.3372730763.

Adding to 813140 its reverse (41318), we get a palindrome (854458).

The spelling of 813140 in words is "eight hundred thirteen thousand, one hundred forty".