394378320 has 80 divisors (see below), whose sum is σ = 1397232000. Its totient is φ = 90143232.

The previous prime is 394378319. The next prime is 394378321. The reversal of 394378320 is 23873493.

It is an interprime number because it is at equal distance from previous prime (394378319) and next prime (394378321).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394378321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 115695 + ... + 119054.

It is an arithmetic number, because the mean of its divisors is an integer number (17465400).

Almost surely, 2^394378320 is an apocalyptic number.

394378320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394378320 is an abundant number, since it is smaller than the sum of its proper divisors (1002853680).

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

394378320 is a wasteful number, since it uses less digits than its factorization.

394378320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234772 (or 234766 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 394378320 is about 19858.9606978814. The cubic root of 394378320 is about 733.3382607566.

The spelling of 394378320 in words is "three hundred ninety-four million, three hundred seventy-eight thousand, three hundred twenty".