394021211 has 4 divisors (see below), whose sum is σ = 411152592. Its totient is φ = 376889832.

The previous prime is 394021181. The next prime is 394021217. The reversal of 394021211 is 112120493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112120493 = 53 ⋅2115481.

It is a cyclic number.

It is not a de Polignac number, because 394021211 - 2¹⁴ = 394004827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 17131357 = 394021211 / (3 + 9 + 4 + 0 + 2 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394021217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8565656 + ... + 8565701.

It is an arithmetic number, because the mean of its divisors is an integer number (102788148).

Almost surely, 2^394021211 is an apocalyptic number.

394021211 is a deficient number, since it is larger than the sum of its proper divisors (17131381).

394021211 is a wasteful number, since it uses less digits than its factorization.

394021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17131380.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 394021211 is about 19849.9675314596. The cubic root of 394021211 is about 733.1168483344.

The spelling of 394021211 in words is "three hundred ninety-four million, twenty-one thousand, two hundred eleven".