381777813 has 16 divisors (see below), whose sum is σ = 565936000. Its totient is φ = 254365920.

The previous prime is 381777793. The next prime is 381777821. The reversal of 381777813 is 318777183.

It is not a de Polignac number, because 381777813 - 2²⁸ = 113342357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381777853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58488 + ... + 64686.

It is an arithmetic number, because the mean of its divisors is an integer number (35371000).

Almost surely, 2^381777813 is an apocalyptic number.

It is an amenable number.

381777813 is a deficient number, since it is larger than the sum of its proper divisors (184158187).

381777813 is a wasteful number, since it uses less digits than its factorization.

381777813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8489 (or 8483 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 381777813 is about 19539.1354209955. The cubic root of 381777813 is about 725.4434468235.

The spelling of 381777813 in words is "three hundred eighty-one million, seven hundred seventy-seven thousand, eight hundred thirteen".