406366399 has 4 divisors (see below), whose sum is σ = 411933136. Its totient is φ = 400799664.

The previous prime is 406366379. The next prime is 406366417. The reversal of 406366399 is 993663604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406366399 - 2¹⁷ = 406235327 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 (406366309) 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, 2783259 + ... + 2783404.

It is an arithmetic number, because the mean of its divisors is an integer number (102983284).

Almost surely, 2^406366399 is an apocalyptic number.

406366399 is a deficient number, since it is larger than the sum of its proper divisors (5566737).

406366399 is an equidigital number, since it uses as much as digits as its factorization.

406366399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566736.

The product of its (nonzero) digits is 629856, while the sum is 46.

The square root of 406366399 is about 20158.5316677579. The cubic root of 406366399 is about 740.6947450303.

The spelling of 406366399 in words is "four hundred six million, three hundred sixty-six thousand, three hundred ninety-nine".