394920444981 has 8 divisors (see below), whose sum is σ = 530706740224. Its totient is φ = 261207223200.

The previous prime is 394920444937. The next prime is 394920445063. The reversal of 394920444981 is 189444029493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 394920444981 - 2¹¹ = 394920442933 is a prime.

It is a super-2 number, since 2×394920444981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394920444481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518267920 + ... + 518268681.

It is an arithmetic number, because the mean of its divisors is an integer number (66338342528).

Almost surely, 2^394920444981 is an apocalyptic number.

It is an amenable number.

394920444981 is a deficient number, since it is larger than the sum of its proper divisors (135786295243).

394920444981 is a wasteful number, since it uses less digits than its factorization.

394920444981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036536731.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 394920444981 in words is "three hundred ninety-four billion, nine hundred twenty million, four hundred forty-four thousand, nine hundred eighty-one".