408669 has 4 divisors (see below), whose sum is σ = 544896. Its totient is φ = 272444.

The previous prime is 408659. The next prime is 408677. The reversal of 408669 is 966804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 408669 - 2⁵ = 408637 is a prime.

It is a super-2 number, since 2×408669² = 334020703122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 408669.

It is not an unprimeable number, because it can be changed into a prime (408659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68109 + ... + 68114.

It is an arithmetic number, because the mean of its divisors is an integer number (136224).

2⁴⁰⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

408669 is a deficient number, since it is larger than the sum of its proper divisors (136227).

408669 is a wasteful number, since it uses less digits than its factorization.

408669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136226.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 408669 is about 639.2722424758. The cubic root of 408669 is about 74.2091114759.

The spelling of 408669 in words is "four hundred eight thousand, six hundred sixty-nine".