394981760 has 64 divisors (see below), whose sum is σ = 985344480. Its totient is φ = 151117824.

The previous prime is 394981753. The next prime is 394981781. The reversal of 394981760 is 67189493.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304 + ... + 28136.

Almost surely, 2^394981760 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 394981760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492672240).

394981760 is an abundant number, since it is smaller than the sum of its proper divisors (590362720).

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

394981760 is a wasteful number, since it uses less digits than its factorization.

394981760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26875 (or 26863 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 394981760 is about 19874.1480320541. The cubic root of 394981760 is about 733.7120981828.

The spelling of 394981760 in words is "three hundred ninety-four million, nine hundred eighty-one thousand, seven hundred sixty".