394289280 has 576 divisors, whose sum is σ = 1741409280. Its totient is φ = 81285120.

The previous prime is 394289267. The next prime is 394289281. The reversal of 394289280 is 82982493.

394289280 is a `hidden beast` number, since 3 + 94 + 289 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

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 (394289281) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3104577 + ... + 3104703.

It is an arithmetic number, because the mean of its divisors is an integer number (3023280).

Almost surely, 2^394289280 is an apocalyptic number.

394289280 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 394289280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870704640).

394289280 is an abundant number, since it is smaller than the sum of its proper divisors (1347120000).

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

394289280 is a wasteful number, since it uses less digits than its factorization.

394289280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 394289280 is about 19856.7187621722. The cubic root of 394289280 is about 733.2830672617.

The spelling of 394289280 in words is "three hundred ninety-four million, two hundred eighty-nine thousand, two hundred eighty".