381784686 has 16 divisors (see below), whose sum is σ = 764640000. Its totient is φ = 127083128.

The previous prime is 381784673. The next prime is 381784709. The reversal of 381784686 is 686487183.

381784686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39936 + ... + 48563.

It is an arithmetic number, because the mean of its divisors is an integer number (47790000).

Almost surely, 2^381784686 is an apocalyptic number.

381784686 is an abundant number, since it is smaller than the sum of its proper divisors (382855314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381784686 is a wasteful number, since it uses less digits than its factorization.

381784686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89223.

The product of its digits is 1548288, while the sum is 51.

The square root of 381784686 is about 19539.3112979962. The cubic root of 381784686 is about 725.4478000910.

The spelling of 381784686 in words is "three hundred eighty-one million, seven hundred eighty-four thousand, six hundred eighty-six".