394985817252 has 288 divisors, whose sum is σ = 1110492923904. Its totient is φ = 117630489600.

The previous prime is 394985817227. The next prime is 394985817253. The reversal of 394985817252 is 252718589493.

394985817252 is a `hidden beast` number, since 3 + 9 + 49 + 8 + 581 + 7 + 2 + 5 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 394985817252.

It is not an unprimeable number, because it can be changed into a prime (394985817253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 583435138 + ... + 583435814.

It is an arithmetic number, because the mean of its divisors is an integer number (3855878208).

Almost surely, 2^394985817252 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 394985817252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (555246461952).

394985817252 is an abundant number, since it is smaller than the sum of its proper divisors (715507106652).

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

394985817252 is a wasteful number, since it uses less digits than its factorization.

394985817252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059 (or 1054 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 63.

The spelling of 394985817252 in words is "three hundred ninety-four billion, nine hundred eighty-five million, eight hundred seventeen thousand, two hundred fifty-two".