384393778 has 16 divisors (see below), whose sum is σ = 594982584. Its totient is φ = 186135040.

The previous prime is 384393743. The next prime is 384393781. The reversal of 384393778 is 877393483.

It can be written as a sum of positive squares in 4 ways, for example, as 341399529 + 42994249 = 18477^2 + 6557^2 .

It is a super-2 number, since 2×384393778² = 295517153130226568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5875 + ... + 28342.

Almost surely, 2^384393778 is an apocalyptic number.

384393778 is a deficient number, since it is larger than the sum of its proper divisors (210588806).

384393778 is a wasteful number, since it uses less digits than its factorization.

384393778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34397.

The product of its digits is 3048192, while the sum is 52.

The square root of 384393778 is about 19605.9628174696. The cubic root of 384393778 is about 727.0966043775.

The spelling of 384393778 in words is "three hundred eighty-four million, three hundred ninety-three thousand, seven hundred seventy-eight".