394407680 has 72 divisors (see below), whose sum is σ = 985878432. Its totient is φ = 150892544.

The previous prime is 394407661. The next prime is 394407731. The reversal of 394407680 is 86704493.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22742 + ... + 36138.

It is an arithmetic number, because the mean of its divisors is an integer number (13692756).

Almost surely, 2^394407680 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 394407680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492939216).

394407680 is an abundant number, since it is smaller than the sum of its proper divisors (591470752).

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

394407680 is a wasteful number, since it uses less digits than its factorization.

394407680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13441 (or 13427 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 394407680 is about 19859.6998970276. The cubic root of 394407680 is about 733.3564584076.

The spelling of 394407680 in words is "three hundred ninety-four million, four hundred seven thousand, six hundred eighty".