394821504 has 192 divisors, whose sum is σ = 1416804480. Its totient is φ = 102528000.

The previous prime is 394821503. The next prime is 394821509. The reversal of 394821504 is 405128493.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394821503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86479 + ... + 90929.

It is an arithmetic number, because the mean of its divisors is an integer number (7379190).

Almost surely, 2^394821504 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 394821504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708402240).

394821504 is an abundant number, since it is smaller than the sum of its proper divisors (1021982976).

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

394821504 is a wasteful number, since it uses less digits than its factorization.

394821504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489 (or 4474 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 394821504 is about 19870.1158527070. The cubic root of 394821504 is about 733.6128550584.

Adding to 394821504 its reverse (405128493), we get a palindrome (799949997).

It can be divided in two parts, 3948 and 21504, that added together give a palindrome (25452).

The spelling of 394821504 in words is "three hundred ninety-four million, eight hundred twenty-one thousand, five hundred four".