378787609 has 2 divisors, whose sum is σ = 378787610. Its totient is φ = 378787608.

The previous prime is 378787511. The next prime is 378787631. The reversal of 378787609 is 906787873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338744025 + 40043584 = 18405^2 + 6328^2 .

It is a cyclic number.

It is not a de Polignac number, because 378787609 - 2¹³ = 378779417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 378787609.

It is not a weakly prime, because it can be changed into another prime (378787309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189393804 + 189393805.

It is an arithmetic number, because the mean of its divisors is an integer number (189393805).

Almost surely, 2^378787609 is an apocalyptic number.

It is an amenable number.

378787609 is a deficient number, since it is larger than the sum of its proper divisors (1).

378787609 is an equidigital number, since it uses as much as digits as its factorization.

378787609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The square root of 378787609 is about 19462.4666730607. The cubic root of 378787609 is about 723.5445133402.

The spelling of 378787609 in words is "three hundred seventy-eight million, seven hundred eighty-seven thousand, six hundred nine".