378787509 has 20 divisors (see below), whose sum is σ = 566626060. Its totient is φ = 252175680.

The previous prime is 378787501. The next prime is 378787511. The reversal of 378787509 is 905787873.

It can be written as a sum of positive squares in 2 ways, for example, as 319158225 + 59629284 = 17865^2 + 7722^2 .

It is not a de Polignac number, because 378787509 - 2³ = 378787501 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 (378787501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64329 + ... + 69969.

It is an arithmetic number, because the mean of its divisors is an integer number (28331303).

Almost surely, 2^378787509 is an apocalyptic number.

It is an amenable number.

378787509 is a deficient number, since it is larger than the sum of its proper divisors (187838551).

378787509 is an equidigital number, since it uses as much as digits as its factorization.

378787509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6482 (or 6473 counting only the distinct ones).

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

The square root of 378787509 is about 19462.4641040131. The cubic root of 378787509 is about 723.5444496682.

The spelling of 378787509 in words is "three hundred seventy-eight million, seven hundred eighty-seven thousand, five hundred nine".