813530140 has 12 divisors (see below), whose sum is σ = 1708413336. Its totient is φ = 325412048.

The previous prime is 813530131. The next prime is 813530149. The reversal of 813530140 is 41035318.

It is an interprime number because it is at equal distance from previous prime (813530131) and next prime (813530149).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813530149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20338234 + ... + 20338273.

It is an arithmetic number, because the mean of its divisors is an integer number (142367778).

Almost surely, 2^813530140 is an apocalyptic number.

It is an amenable number.

813530140 is an abundant number, since it is smaller than the sum of its proper divisors (894883196).

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

813530140 is a wasteful number, since it uses less digits than its factorization.

813530140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40676516 (or 40676514 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 813530140 is about 28522.4497545355. The cubic root of 813530140 is about 933.5219825585.

Adding to 813530140 its reverse (41035318), we get a palindrome (854565458).

The spelling of 813530140 in words is "eight hundred thirteen million, five hundred thirty thousand, one hundred forty".