396573840 has 320 divisors, whose sum is σ = 1524902400. Its totient is φ = 94058496.

The previous prime is 396573829. The next prime is 396573847. The reversal of 396573840 is 48375693.

396573840 is a `hidden beast` number, since 39 + 6 + 573 + 8 + 40 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (396573847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 814077 + ... + 814563.

It is an arithmetic number, because the mean of its divisors is an integer number (4765320).

Almost surely, 2^396573840 is an apocalyptic number.

396573840 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 396573840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762451200).

396573840 is an abundant number, since it is smaller than the sum of its proper divisors (1128328560).

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

396573840 is a wasteful number, since it uses less digits than its factorization.

396573840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 396573840 is about 19914.1617950643. The cubic root of 396573840 is about 734.6965844685.

The spelling of 396573840 in words is "three hundred ninety-six million, five hundred seventy-three thousand, eight hundred forty".