394275021 has 12 divisors (see below), whose sum is σ = 611528832. Its totient is φ = 225299928.

The previous prime is 394275001. The next prime is 394275047. The reversal of 394275021 is 120572493.

It is not a de Polignac number, because 394275021 - 2⁵ = 394274989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394275001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1340925 + ... + 1341218.

It is an arithmetic number, because the mean of its divisors is an integer number (50960736).

Almost surely, 2^394275021 is an apocalyptic number.

It is an amenable number.

394275021 is a deficient number, since it is larger than the sum of its proper divisors (217253811).

394275021 is a wasteful number, since it uses less digits than its factorization.

394275021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682160 (or 2682153 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 394275021 is about 19856.3597116894. The cubic root of 394275021 is about 733.2742277202.

The spelling of 394275021 in words is "three hundred ninety-four million, two hundred seventy-five thousand, twenty-one".