815963494 has 4 divisors (see below), whose sum is σ = 1223945244. Its totient is φ = 407981746.

The previous prime is 815963483. The next prime is 815963497. The reversal of 815963494 is 494369518.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815963497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203990872 + ... + 203990875.

It is an arithmetic number, because the mean of its divisors is an integer number (305986311).

Almost surely, 2^815963494 is an apocalyptic number.

815963494 is a deficient number, since it is larger than the sum of its proper divisors (407981750).

815963494 is a wasteful number, since it uses less digits than its factorization.

815963494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407981749.

The product of its digits is 933120, while the sum is 49.

The square root of 815963494 is about 28565.0747242152. The cubic root of 815963494 is about 934.4518101665.

The spelling of 815963494 in words is "eight hundred fifteen million, nine hundred sixty-three thousand, four hundred ninety-four".