405899 has 4 divisors (see below), whose sum is σ = 437136. Its totient is φ = 374664.

The previous prime is 405893. The next prime is 405901. The reversal of 405899 is 998504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405899 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405899.

It is not an unprimeable number, because it can be changed into a prime (405893) 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, 15599 + ... + 15624.

It is an arithmetic number, because the mean of its divisors is an integer number (109284).

2⁴⁰⁵⁸⁹⁹ is an apocalyptic number.

405899 is a deficient number, since it is larger than the sum of its proper divisors (31237).

405899 is a wasteful number, since it uses less digits than its factorization.

405899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31236.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 405899 is about 637.1020326447. The cubic root of 405899 is about 74.0410655925.

The spelling of 405899 in words is "four hundred five thousand, eight hundred ninety-nine".