394563421271928 has 128 divisors (see below), whose sum is σ = 997310627550720. Its totient is φ = 130069560360960.

The previous prime is 394563421271897. The next prime is 394563421271951. The reversal of 394563421271928 is 829172124365493.

It is a super-3 number, since 3×394563421271928³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24649421701 + ... + 24649437707.

It is an arithmetic number, because the mean of its divisors is an integer number (7791489277740).

Almost surely, 2^{394563421271928} is an apocalyptic number.

It is an amenable number.

394563421271928 is an abundant number, since it is smaller than the sum of its proper divisors (602747206278792).

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

394563421271928 is a wasteful number, since it uses less digits than its factorization.

394563421271928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23237 (or 23233 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 66.

The spelling of 394563421271928 in words is "three hundred ninety-four trillion, five hundred sixty-three billion, four hundred twenty-one million, two hundred seventy-one thousand, nine hundred twenty-eight".