394444872281 has 8 divisors (see below), whose sum is σ = 406485039744. Its totient is φ = 382519922080.

The previous prime is 394444872271. The next prime is 394444872287. The reversal of 394444872281 is 182278444493.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394444872281 is a prime.

It is a super-2 number, since 2×394444872281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394444872287) 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, 28797365 + ... + 28811058.

It is an arithmetic number, because the mean of its divisors is an integer number (50810629968).

Almost surely, 2^394444872281 is an apocalyptic number.

It is an amenable number.

394444872281 is a deficient number, since it is larger than the sum of its proper divisors (12040167463).

394444872281 is a wasteful number, since it uses less digits than its factorization.

394444872281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57608631.

The product of its digits is 12386304, while the sum is 56.

The spelling of 394444872281 in words is "three hundred ninety-four billion, four hundred forty-four million, eight hundred seventy-two thousand, two hundred eighty-one".