394229391 has 16 divisors (see below), whose sum is σ = 540492288. Its totient is φ = 255441600.

The previous prime is 394229389. The next prime is 394229399. The reversal of 394229391 is 193922493.

It is not a de Polignac number, because 394229391 - 2¹ = 394229389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394229399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27420 + ... + 39246.

It is an arithmetic number, because the mean of its divisors is an integer number (33780768).

Almost surely, 2^394229391 is an apocalyptic number.

394229391 is a deficient number, since it is larger than the sum of its proper divisors (146262897).

394229391 is a wasteful number, since it uses less digits than its factorization.

394229391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12142.

The product of its digits is 104976, while the sum is 42.

The square root of 394229391 is about 19855.2106762935. The cubic root of 394229391 is about 733.2459390114.

It can be divided in two parts, 3942 and 29391, that added together give a palindrome (33333).

The spelling of 394229391 in words is "three hundred ninety-four million, two hundred twenty-nine thousand, three hundred ninety-one".