405289 has 8 divisors (see below), whose sum is σ = 433440. Its totient is φ = 377856.

The previous prime is 405287. The next prime is 405299. The reversal of 405289 is 982504.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 405289 - 2¹ = 405287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405287) 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, 1449 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (54180).

2⁴⁰⁵²⁸⁹ is an apocalyptic number.

It is an amenable number.

405289 is a deficient number, since it is larger than the sum of its proper divisors (28151).

405289 is a wasteful number, since it uses less digits than its factorization.

405289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 405289 is about 636.6231224202. The cubic root of 405289 is about 74.0039564478.

It can be divided in two parts, 40 and 5289, that added together give a square (5329 = 73²).

The spelling of 405289 in words is "four hundred five thousand, two hundred eighty-nine".