393221072 has 10 divisors (see below), whose sum is σ = 761865858. Its totient is φ = 196610528.

The previous prime is 393221069. The next prime is 393221107. The reversal of 393221072 is 270122393.

It can be written as a sum of positive squares in only one way, i.e., 384316816 + 8904256 = 19604^2 + 2984^2 .

It is a super-2 number, since 2×393221072² = 309245622929658368, which contains 22 as substring.

It is a congruent 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 as a sum of consecutive naturals, namely, 12288143 + ... + 12288174.

Almost surely, 2^393221072 is an apocalyptic number.

It is an amenable number.

393221072 is a deficient number, since it is larger than the sum of its proper divisors (368644786).

393221072 is a wasteful number, since it uses less digits than its factorization.

393221072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24576325 (or 24576319 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 393221072 is about 19829.8026213072. The cubic root of 393221072 is about 732.6202651721.

The spelling of 393221072 in words is "three hundred ninety-three million, two hundred twenty-one thousand, seventy-two".