384988778 has 4 divisors (see below), whose sum is σ = 577483170. Its totient is φ = 192494388.

The previous prime is 384988771. The next prime is 384988781. The reversal of 384988778 is 877889483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877889483 = 467 ⋅1879849.

It can be written as a sum of positive squares in only one way, i.e., 364313569 + 20675209 = 19087^2 + 4547^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 384988778.

It is not an unprimeable number, because it can be changed into a prime (384988771) by changing a digit.

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 as a sum of consecutive naturals, namely, 96247193 + ... + 96247196.

Almost surely, 2^384988778 is an apocalyptic number.

384988778 is a deficient number, since it is larger than the sum of its proper divisors (192494392).

384988778 is a wasteful number, since it uses less digits than its factorization.

384988778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192494391.

The product of its digits is 21676032, while the sum is 62.

The square root of 384988778 is about 19621.1309052256. The cubic root of 384988778 is about 727.4715666155.

The spelling of 384988778 in words is "three hundred eighty-four million, nine hundred eighty-eight thousand, seven hundred seventy-eight".