393728540 has 12 divisors (see below), whose sum is σ = 826829976. Its totient is φ = 157491408.

The previous prime is 393728539. The next prime is 393728609. The reversal of 393728540 is 45827393.

It is a congruent number.

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, 9843194 + ... + 9843233.

It is an arithmetic number, because the mean of its divisors is an integer number (68902498).

Almost surely, 2^393728540 is an apocalyptic number.

It is an amenable number.

393728540 is an abundant number, since it is smaller than the sum of its proper divisors (433101436).

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

393728540 is a wasteful number, since it uses less digits than its factorization.

393728540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19686436 (or 19686434 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 393728540 is about 19842.5940844437. The cubic root of 393728540 is about 732.9352885764.

The spelling of 393728540 in words is "three hundred ninety-three million, seven hundred twenty-eight thousand, five hundred forty".