378787905 has 24 divisors (see below), whose sum is σ = 658687848. Its totient is φ = 201367296.

The previous prime is 378787891. The next prime is 378787909. The reversal of 378787905 is 509787873.

It can be written as a sum of positive squares in 4 ways, for example, as 23503104 + 355284801 = 4848^2 + 18849^2 .

It is not a de Polignac number, because 378787905 - 2⁹ = 378787393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (378787909) 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 23 ways as a sum of consecutive naturals, for example, 639 + ... + 27531.

It is an arithmetic number, because the mean of its divisors is an integer number (27445327).

Almost surely, 2^378787905 is an apocalyptic number.

It is an amenable number.

378787905 is a deficient number, since it is larger than the sum of its proper divisors (279899943).

378787905 is a wasteful number, since it uses less digits than its factorization.

378787905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27217 (or 27214 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The square root of 378787905 is about 19462.4742774396. The cubic root of 378787905 is about 723.5447018091.

The spelling of 378787905 in words is "three hundred seventy-eight million, seven hundred eighty-seven thousand, nine hundred five".