394982784 has 256 divisors, whose sum is σ = 1380672000. Its totient is φ = 108767232.

The previous prime is 394982767. The next prime is 394982837. The reversal of 394982784 is 487289493.

It is a super-2 number, since 2×394982784² = 312022799312781312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 394982784.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 701287 + ... + 701849.

It is an arithmetic number, because the mean of its divisors is an integer number (5393250).

Almost surely, 2^394982784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394982784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690336000).

394982784 is an abundant number, since it is smaller than the sum of its proper divisors (985689216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394982784 is a wasteful number, since it uses less digits than its factorization.

394982784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 604 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 394982784 is about 19874.1737941480. The cubic root of 394982784 is about 733.7127322378.

The spelling of 394982784 in words is "three hundred ninety-four million, nine hundred eighty-two thousand, seven hundred eighty-four".