394117520 has 20 divisors (see below), whose sum is σ = 916323420. Its totient is φ = 157646976.

The previous prime is 394117457. The next prime is 394117531. The reversal of 394117520 is 25711493.

It can be written as a sum of positive squares in 2 ways, for example, as 55115776 + 339001744 = 7424^2 + 18412^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2463155 + ... + 2463314.

It is an arithmetic number, because the mean of its divisors is an integer number (45816171).

Almost surely, 2^394117520 is an apocalyptic number.

It is an amenable number.

394117520 is an abundant number, since it is smaller than the sum of its proper divisors (522205900).

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

394117520 is a wasteful number, since it uses less digits than its factorization.

394117520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926482 (or 4926476 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 394117520 is about 19852.3933066016. The cubic root of 394117520 is about 733.1765743904.

The spelling of 394117520 in words is "three hundred ninety-four million, one hundred seventeen thousand, five hundred twenty".