394377680 has 40 divisors (see below), whose sum is σ = 965191200. Its totient is φ = 149447808.

The previous prime is 394377671. The next prime is 394377689. The reversal of 394377680 is 86773493.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (394377671) and next prime (394377689).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394377689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128210 + ... + 131249.

It is an arithmetic number, because the mean of its divisors is an integer number (24129780).

Almost surely, 2^394377680 is an apocalyptic number.

It is an amenable number.

394377680 is an abundant number, since it is smaller than the sum of its proper divisors (570813520).

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

394377680 is a wasteful number, since it uses less digits than its factorization.

394377680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259491 (or 259485 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 394377680 is about 19858.9445842421. The cubic root of 394377680 is about 733.3378640675.

The spelling of 394377680 in words is "three hundred ninety-four million, three hundred seventy-seven thousand, six hundred eighty".