378689869 has 2 divisors, whose sum is σ = 378689870. Its totient is φ = 378689868.

The previous prime is 378689867. The next prime is 378689873. The reversal of 378689869 is 968986873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352012644 + 26677225 = 18762^2 + 5165^2 .

It is an emirp because it is prime and its reverse (968986873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378689869 - 2¹ = 378689867 is a prime.

It is a super-2 number, since 2×378689869² = 286812033766474322, which contains 22 as substring.

Together with 378689867, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 378689869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378689867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189344934 + 189344935.

It is an arithmetic number, because the mean of its divisors is an integer number (189344935).

Almost surely, 2^378689869 is an apocalyptic number.

It is an amenable number.

378689869 is a deficient number, since it is larger than the sum of its proper divisors (1).

378689869 is an equidigital number, since it uses as much as digits as its factorization.

378689869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 64.

The square root of 378689869 is about 19459.9555241013. The cubic root of 378689869 is about 723.4822750105.

The spelling of 378689869 in words is "three hundred seventy-eight million, six hundred eighty-nine thousand, eight hundred sixty-nine".