387819381 has 4 divisors (see below), whose sum is σ = 517092512. Its totient is φ = 258546252.

The previous prime is 387819361. The next prime is 387819433. The reversal of 387819381 is 183918783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 387819381 - 2⁹ = 387818869 is a prime.

It is a super-2 number, since 2×387819381² = 300807744558446322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 387819381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387819301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64636561 + ... + 64636566.

It is an arithmetic number, because the mean of its divisors is an integer number (129273128).

Almost surely, 2^387819381 is an apocalyptic number.

It is an amenable number.

387819381 is a deficient number, since it is larger than the sum of its proper divisors (129273131).

387819381 is a wasteful number, since it uses less digits than its factorization.

387819381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129273130.

The product of its digits is 290304, while the sum is 48.

The square root of 387819381 is about 19693.1302996756. The cubic root of 387819381 is about 729.2501094052.

The spelling of 387819381 in words is "three hundred eighty-seven million, eight hundred nineteen thousand, three hundred eighty-one".