810297140 has 12 divisors (see below), whose sum is σ = 1701624036. Its totient is φ = 324118848.

The previous prime is 810297139. The next prime is 810297143. The reversal of 810297140 is 41792018.

It can be written as a sum of positive squares in 2 ways, for example, as 414366736 + 395930404 = 20356^2 + 19898^2 .

It is a junction number, because it is equal to n+sod(n) for n = 810297097 and 810297106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810297143) 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, 20257409 + ... + 20257448.

It is an arithmetic number, because the mean of its divisors is an integer number (141802003).

Almost surely, 2^810297140 is an apocalyptic number.

It is an amenable number.

810297140 is an abundant number, since it is smaller than the sum of its proper divisors (891326896).

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

810297140 is a wasteful number, since it uses less digits than its factorization.

810297140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40514866 (or 40514864 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 810297140 is about 28465.7186805463. The cubic root of 810297140 is about 932.2837234147.

The spelling of 810297140 in words is "eight hundred ten million, two hundred ninety-seven thousand, one hundred forty".