813778383 has 16 divisors (see below), whose sum is σ = 1195174656. Its totient is φ = 488408640.

The previous prime is 813778349. The next prime is 813778391. The reversal of 813778383 is 383877318.

It is not a de Polignac number, because 813778383 - 2¹² = 813774287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813778183) 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, 116310 + ... + 123107.

It is an arithmetic number, because the mean of its divisors is an integer number (74698416).

Almost surely, 2^813778383 is an apocalyptic number.

813778383 is a deficient number, since it is larger than the sum of its proper divisors (381396273).

813778383 is a wasteful number, since it uses less digits than its factorization.

813778383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239534.

The product of its digits is 677376, while the sum is 48.

The square root of 813778383 is about 28526.8011350730. The cubic root of 813778383 is about 933.6169254577.

The spelling of 813778383 in words is "eight hundred thirteen million, seven hundred seventy-eight thousand, three hundred eighty-three".