408129 has 4 divisors (see below), whose sum is σ = 544176. Its totient is φ = 272084.

The previous prime is 408127. The next prime is 408131. The reversal of 408129 is 921804.

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 an interprime number because it is at equal distance from previous prime (408127) and next prime (408131).

It is a cyclic number.

It is not a de Polignac number, because 408129 - 2¹ = 408127 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 408099 and 408108.

It is not an unprimeable number, because it can be changed into a prime (408127) 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, 68019 + ... + 68024.

It is an arithmetic number, because the mean of its divisors is an integer number (136044).

2⁴⁰⁸¹²⁹ is an apocalyptic number.

It is an amenable number.

408129 is a deficient number, since it is larger than the sum of its proper divisors (136047).

408129 is a wasteful number, since it uses less digits than its factorization.

408129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136046.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 408129 is about 638.8497475933. The cubic root of 408129 is about 74.1764113499.

The spelling of 408129 in words is "four hundred eight thousand, one hundred twenty-nine".