396428191 has 8 divisors (see below), whose sum is σ = 399567168. Its totient is φ = 393300000.

The previous prime is 396428189. The next prime is 396428243. The reversal of 396428191 is 191824693.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 396428191 - 2¹ = 396428189 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 (396428171) 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, 81066 + ... + 85816.

It is an arithmetic number, because the mean of its divisors is an integer number (49945896).

Almost surely, 2^396428191 is an apocalyptic number.

396428191 is a deficient number, since it is larger than the sum of its proper divisors (3138977).

396428191 is a wasteful number, since it uses less digits than its factorization.

396428191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5393.

The product of its digits is 93312, while the sum is 43.

The square root of 396428191 is about 19910.5045390618. The cubic root of 396428191 is about 734.6066298666.

The spelling of 396428191 in words is "three hundred ninety-six million, four hundred twenty-eight thousand, one hundred ninety-one".