815403243 has 16 divisors (see below), whose sum is σ = 1100072736. Its totient is φ = 537185280.

The previous prime is 815403233. The next prime is 815403247. The reversal of 815403243 is 342304518.

It is not a de Polignac number, because 815403243 - 2¹² = 815399147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815403243.

It is not an unprimeable number, because it can be changed into a prime (815403247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237205 + ... + 240617.

It is an arithmetic number, because the mean of its divisors is an integer number (68754546).

Almost surely, 2^815403243 is an apocalyptic number.

815403243 is a deficient number, since it is larger than the sum of its proper divisors (284669493).

815403243 is a wasteful number, since it uses less digits than its factorization.

815403243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 815403243 is about 28555.2664669759. The cubic root of 815403243 is about 934.2378923336.

The spelling of 815403243 in words is "eight hundred fifteen million, four hundred three thousand, two hundred forty-three".