393633220 has 12 divisors (see below), whose sum is σ = 826629804. Its totient is φ = 157453280.

The previous prime is 393633217. The next prime is 393633271. The reversal of 393633220 is 22336393.

It can be written as a sum of positive squares in 2 ways, for example, as 223382916 + 170250304 = 14946^2 + 13048^2 .

It is a super-2 number, since 2×393633220² = 309894223775136800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9840811 + ... + 9840850.

It is an arithmetic number, because the mean of its divisors is an integer number (68885817).

Almost surely, 2^393633220 is an apocalyptic number.

It is an amenable number.

393633220 is an abundant number, since it is smaller than the sum of its proper divisors (432996584).

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

393633220 is a wasteful number, since it uses less digits than its factorization.

393633220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19681670 (or 19681668 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 31.

The square root of 393633220 is about 19840.1920353609. The cubic root of 393633220 is about 732.8761369671.

The spelling of 393633220 in words is "three hundred ninety-three million, six hundred thirty-three thousand, two hundred twenty".