378888889 has 4 divisors (see below), whose sum is σ = 378961524. Its totient is φ = 378816256.

The previous prime is 378888883. The next prime is 378888901. The reversal of 378888889 is 988888873.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 358458489 = 4520^2 + 18933^2 .

It is a cyclic number.

It is not a de Polignac number, because 378888889 - 2¹⁷ = 378757817 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (378888883) 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, 27832 + ... + 39145.

It is an arithmetic number, because the mean of its divisors is an integer number (94740381).

Almost surely, 2^378888889 is an apocalyptic number.

It is an amenable number.

378888889 is a deficient number, since it is larger than the sum of its proper divisors (72635).

378888889 is an equidigital number, since it uses as much as digits as its factorization.

378888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72634.

The product of its digits is 49545216, while the sum is 67.

The square root of 378888889 is about 19465.0684303960. The cubic root of 378888889 is about 723.6089945572.

The spelling of 378888889 in words is "three hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".