394279542021 has 8 divisors (see below), whose sum is σ = 529845474304. Its totient is φ = 260783318880.

The previous prime is 394279542011. The next prime is 394279542047. The reversal of 394279542021 is 120245972493.

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

It is not a de Polignac number, because 394279542021 - 2²² = 394275347717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394279542001) 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, 517426840 + ... + 517427601.

It is an arithmetic number, because the mean of its divisors is an integer number (66230684288).

Almost surely, 2^394279542021 is an apocalyptic number.

It is an amenable number.

394279542021 is a deficient number, since it is larger than the sum of its proper divisors (135565932283).

394279542021 is a wasteful number, since it uses less digits than its factorization.

394279542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034854571.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 394279542021 in words is "three hundred ninety-four billion, two hundred seventy-nine million, five hundred forty-two thousand, twenty-one".