393540028 has 54 divisors (see below), whose sum is σ = 827867544. Its totient is φ = 160337232.

The previous prime is 393540013. The next prime is 393540041. The reversal of 393540028 is 820045393.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 393539975 and 393540002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2414275 + ... + 2414437.

Almost surely, 2^393540028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 393540028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413933772).

393540028 is an abundant number, since it is smaller than the sum of its proper divisors (434327516).

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

393540028 is a wasteful number, since it uses less digits than its factorization.

393540028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 393540028 is about 19837.8433303623. The cubic root of 393540028 is about 732.8182966731.

The spelling of 393540028 in words is "three hundred ninety-three million, five hundred forty thousand, twenty-eight".