394973280 has 288 divisors, whose sum is σ = 1499692320. Its totient is φ = 97044480.

The previous prime is 394973269. The next prime is 394973321. The reversal of 394973280 is 82379493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

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 47 ways as a sum of consecutive naturals, for example, 729810 + ... + 730350.

It is an arithmetic number, because the mean of its divisors is an integer number (5207265).

Almost surely, 2^394973280 is an apocalyptic number.

394973280 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 394973280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749846160).

394973280 is an abundant number, since it is smaller than the sum of its proper divisors (1104719040).

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

394973280 is a wasteful number, since it uses less digits than its factorization.

394973280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 394973280 is about 19873.9346884305. The cubic root of 394973280 is about 733.7068473723.

The spelling of 394973280 in words is "three hundred ninety-four million, nine hundred seventy-three thousand, two hundred eighty".