394520453280 has 768 divisors, whose sum is σ = 1450969873920. Its totient is φ = 101284577280.

The previous prime is 394520453219. The next prime is 394520453281. The reversal of 394520453280 is 82354025493.

394520453280 is a `hidden beast` number, since 3 + 9 + 4 + 520 + 45 + 3 + 2 + 80 = 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 (394520453281) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1535098912 + ... + 1535099168.

It is an arithmetic number, because the mean of its divisors is an integer number (1889283690).

Almost surely, 2^394520453280 is an apocalyptic number.

394520453280 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 394520453280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725484936960).

394520453280 is an abundant number, since it is smaller than the sum of its proper divisors (1056449420640).

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

394520453280 is a wasteful number, since it uses less digits than its factorization.

394520453280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 394520453280 in words is "three hundred ninety-four billion, five hundred twenty million, four hundred fifty-three thousand, two hundred eighty".