394644009424 has 30 divisors (see below), whose sum is σ = 889459140354. Its totient is φ = 169133146560.

The previous prime is 394644009413. The next prime is 394644009457. The reversal of 394644009424 is 424900446493.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 309536449600 + 85107559824 = 556360^2 + 291732^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251685447 + ... + 251687014.

Almost surely, 2^394644009424 is an apocalyptic number.

It is an amenable number.

394644009424 is an abundant number, since it is smaller than the sum of its proper divisors (494815130930).

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

394644009424 is a wasteful number, since it uses less digits than its factorization.

394644009424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503372483 (or 503372470 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 394644009424 in words is "three hundred ninety-four billion, six hundred forty-four million, nine thousand, four hundred twenty-four".