842138378 has 8 divisors (see below), whose sum is σ = 1264362372. Its totient is φ = 420684256.

The previous prime is 842138369. The next prime is 842138431. The reversal of 842138378 is 873831248.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 794845249 + 47293129 = 28193^2 + 6877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189725 + ... + 194112.

Almost surely, 2^842138378 is an apocalyptic number.

842138378 is a deficient number, since it is larger than the sum of its proper divisors (422223994).

842138378 is a wasteful number, since it uses less digits than its factorization.

842138378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384936.

The product of its digits is 258048, while the sum is 44.

The square root of 842138378 is about 29019.6205695388. The cubic root of 842138378 is about 944.3387694461.

The spelling of 842138378 in words is "eight hundred forty-two million, one hundred thirty-eight thousand, three hundred seventy-eight".