408189 has 8 divisors (see below), whose sum is σ = 549952. Its totient is φ = 269280.

The previous prime is 408173. The next prime is 408197. The reversal of 408189 is 981804.

408189 = 142² + 143² + ... + 159².

It is a happy number.

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

It is not a de Polignac number, because 408189 - 2⁴ = 408173 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 (408169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352 + ... + 969.

It is an arithmetic number, because the mean of its divisors is an integer number (68744).

2⁴⁰⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

408189 is a deficient number, since it is larger than the sum of its proper divisors (141763).

408189 is a wasteful number, since it uses less digits than its factorization.

408189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 408189 is about 638.8967052662. The cubic root of 408189 is about 74.1800461211.

The spelling of 408189 in words is "four hundred eight thousand, one hundred eighty-nine".