381378787 has 4 divisors (see below), whose sum is σ = 381431176. Its totient is φ = 381326400.

The previous prime is 381378779. The next prime is 381378817. The reversal of 381378787 is 787873183.

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

It is a cyclic number.

It is not a de Polignac number, because 381378787 - 2³ = 381378779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381378757) 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, 13089 + ... + 30562.

It is an arithmetic number, because the mean of its divisors is an integer number (95357794).

Almost surely, 2^381378787 is an apocalyptic number.

381378787 is a deficient number, since it is larger than the sum of its proper divisors (52389).

381378787 is an equidigital number, since it uses as much as digits as its factorization.

381378787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52388.

The product of its digits is 1580544, while the sum is 52.

The square root of 381378787 is about 19528.9218084358. The cubic root of 381378787 is about 725.1906193977.

The spelling of 381378787 in words is "three hundred eighty-one million, three hundred seventy-eight thousand, seven hundred eighty-seven".