815134340 has 12 divisors (see below), whose sum is σ = 1711782156. Its totient is φ = 326053728.

The previous prime is 815134339. The next prime is 815134351. The reversal of 815134340 is 43431518.

It can be written as a sum of positive squares in 2 ways, for example, as 154952704 + 660181636 = 12448^2 + 25694^2 .

It is a super-3 number, since 3×815134340³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20378339 + ... + 20378378.

It is an arithmetic number, because the mean of its divisors is an integer number (142648513).

Almost surely, 2^815134340 is an apocalyptic number.

It is an amenable number.

815134340 is an abundant number, since it is smaller than the sum of its proper divisors (896647816).

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

815134340 is a wasteful number, since it uses less digits than its factorization.

815134340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40756726 (or 40756724 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 815134340 is about 28550.5576127683. The cubic root of 815134340 is about 934.1351836452.

Adding to 815134340 its reverse (43431518), we get a palindrome (858565858).

The spelling of 815134340 in words is "eight hundred fifteen million, one hundred thirty-four thousand, three hundred forty".