320666394 has 16 divisors (see below), whose sum is σ = 656248032. Its totient is φ = 104402928.

The previous prime is 320666341. The next prime is 320666417. The reversal of 320666394 is 493666023.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621189 + ... + 621704.

It is an arithmetic number, because the mean of its divisors is an integer number (41015502).

Almost surely, 2^320666394 is an apocalyptic number.

320666394 is an abundant number, since it is smaller than the sum of its proper divisors (335581638).

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

320666394 is a wasteful number, since it uses less digits than its factorization.

320666394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242941.

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 320666394 is about 17907.1604114108. The cubic root of 320666394 is about 684.4648485110.

The spelling of 320666394 in words is "three hundred twenty million, six hundred sixty-six thousand, three hundred ninety-four".