396440186 has 8 divisors (see below), whose sum is σ = 595501140. Its totient is φ = 197939808.

The previous prime is 396440171. The next prime is 396440189. The reversal of 396440186 is 681044693.

It can be written as a sum of positive squares in 2 ways, for example, as 346667161 + 49773025 = 18619^2 + 7055^2 .

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

It is not an unprimeable number, because it can be changed into a prime (396440189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138371 + ... + 141206.

Almost surely, 2^396440186 is an apocalyptic number.

396440186 is a deficient number, since it is larger than the sum of its proper divisors (199060954).

396440186 is a wasteful number, since it uses less digits than its factorization.

396440186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280288.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 396440186 is about 19910.8057596874. The cubic root of 396440186 is about 734.6140389576.

The spelling of 396440186 in words is "three hundred ninety-six million, four hundred forty thousand, one hundred eighty-six".