381869978 has 16 divisors (see below), whose sum is σ = 659634624. Its totient is φ = 162408480.

The previous prime is 381869927. The next prime is 381870029. The reversal of 381869978 is 879968183.

381869978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (381869927) and next prime (381870029).

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 102275 + ... + 105942.

It is an arithmetic number, because the mean of its divisors is an integer number (41227164).

Almost surely, 2^381869978 is an apocalyptic number.

381869978 is a deficient number, since it is larger than the sum of its proper divisors (277764646).

381869978 is a wasteful number, since it uses less digits than its factorization.

381869978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208357.

The product of its digits is 5225472, while the sum is 59.

The square root of 381869978 is about 19541.4937504787. The cubic root of 381869978 is about 725.5018185722.

The spelling of 381869978 in words is "three hundred eighty-one million, eight hundred sixty-nine thousand, nine hundred seventy-eight".