393928920 has 320 divisors, whose sum is σ = 1651795200. Its totient is φ = 81803520.

The previous prime is 393928907. The next prime is 393928963. The reversal of 393928920 is 29829393.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 248691 + ... + 250269.

It is an arithmetic number, because the mean of its divisors is an integer number (5161860).

Almost surely, 2^393928920 is an apocalyptic number.

393928920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 393928920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825897600).

393928920 is an abundant number, since it is smaller than the sum of its proper divisors (1257866280).

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

393928920 is a wasteful number, since it uses less digits than its factorization.

393928920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 393928920 is about 19847.6426811851. The cubic root of 393928920 is about 733.0596049099.

The spelling of 393928920 in words is "three hundred ninety-three million, nine hundred twenty-eight thousand, nine hundred twenty".