405887 has 4 divisors (see below), whose sum is σ = 407400. Its totient is φ = 404376.

The previous prime is 405871. The next prime is 405893. The reversal of 405887 is 788504.

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

It is a cyclic number.

It is not a de Polignac number, because 405887 - 2⁴ = 405871 is a prime.

It is a Duffinian 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 405887.

It is not an unprimeable number, because it can be changed into a prime (405817) 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, 233 + ... + 930.

It is an arithmetic number, because the mean of its divisors is an integer number (101850).

2⁴⁰⁵⁸⁸⁷ is an apocalyptic number.

405887 is a deficient number, since it is larger than the sum of its proper divisors (1513).

405887 is a wasteful number, since it uses less digits than its factorization.

405887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 405887 is about 637.0926149313. The cubic root of 405887 is about 74.0403359352.

The spelling of 405887 in words is "four hundred five thousand, eight hundred eighty-seven".