810000040 has 32 divisors (see below), whose sum is σ = 1823332680. Its totient is φ = 323852032.

The previous prime is 810000019. The next prime is 810000049. The reversal of 810000040 is 40000018.

It can be written as a sum of positive squares in 4 ways, for example, as 319908996 + 490091044 = 17886^2 + 22138^2 .

It is a super-2 number, since 2×810000040² = 1312200129600003200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (810000049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139434 + ... + 145126.

Almost surely, 2^810000040 is an apocalyptic number.

It is an amenable number.

810000040 is an abundant number, since it is smaller than the sum of its proper divisors (1013332640).

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

810000040 is a wasteful number, since it uses less digits than its factorization.

810000040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9261 (or 9257 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 810000040 is about 28460.4996442438. The cubic root of 810000040 is about 932.1697671305.

Adding to 810000040 its reverse (40000018), we get a palindrome (850000058).

It can be divided in two parts, 8100000 and 40, that multiplied together give a square (324000000 = 18000²).

The spelling of 810000040 in words is "eight hundred ten million, forty", and thus it is an aban number.