810000039 has 24 divisors (see below), whose sum is σ = 1188463360. Its totient is φ = 489318192.

The previous prime is 810000019. The next prime is 810000049. The reversal of 810000039 is 930000018.

It is not a de Polignac number, because 810000039 - 2¹⁵ = 809967271 is a prime.

It is a super-2 number, since 2×810000039² = 1312200126360003042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810000019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16722 + ... + 43584.

Almost surely, 2^810000039 is an apocalyptic number.

810000039 is a deficient number, since it is larger than the sum of its proper divisors (378463321).

810000039 is a wasteful number, since it uses less digits than its factorization.

810000039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26931 (or 26908 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 810000039 is about 28460.4996266756. The cubic root of 810000039 is about 932.1697667469.

Subtracting from 810000039 its sum of digits (21), we obtain a palindrome (810000018).

The spelling of 810000039 in words is "eight hundred ten million, thirty-nine", and thus it is an aban number.