393145028 has 6 divisors (see below), whose sum is σ = 688003806. Its totient is φ = 196572512.

The previous prime is 393145013. The next prime is 393145031. The reversal of 393145028 is 820541393.

It can be written as a sum of positive squares in only one way, i.e., 374499904 + 18645124 = 19352^2 + 4318^2 .

It is a super-2 number, since 2×393145028² = 309126026082241568, 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 as a sum of consecutive naturals, namely, 49143125 + ... + 49143132.

It is an arithmetic number, because the mean of its divisors is an integer number (114667301).

Almost surely, 2^393145028 is an apocalyptic number.

It is an amenable number.

393145028 is a deficient number, since it is larger than the sum of its proper divisors (294858778).

393145028 is a wasteful number, since it uses less digits than its factorization.

393145028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98286261 (or 98286259 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 393145028 is about 19827.8851116300. The cubic root of 393145028 is about 732.5730356185.

The spelling of 393145028 in words is "three hundred ninety-three million, one hundred forty-five thousand, twenty-eight".