394536505 has 16 divisors (see below), whose sum is σ = 526233024. Its totient is φ = 281519680.

The previous prime is 394536497. The next prime is 394536511. The reversal of 394536505 is 505635493.

It is a happy number.

It is not a de Polignac number, because 394536505 - 2³ = 394536497 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 64759 + ... + 70588.

It is an arithmetic number, because the mean of its divisors is an integer number (32889564).

Almost surely, 2^394536505 is an apocalyptic number.

It is an amenable number.

394536505 is a deficient number, since it is larger than the sum of its proper divisors (131696519).

394536505 is a wasteful number, since it uses less digits than its factorization.

394536505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135416.

The product of its (nonzero) digits is 243000, while the sum is 40.

The square root of 394536505 is about 19862.9430095341. The cubic root of 394536505 is about 733.4362948867.

The spelling of 394536505 in words is "three hundred ninety-four million, five hundred thirty-six thousand, five hundred five".