870405 has 8 divisors (see below), whose sum is σ = 1392672. Its totient is φ = 464208.

The previous prime is 870403. The next prime is 870407. The reversal of 870405 is 504078.

It is an interprime number because it is at equal distance from previous prime (870403) and next prime (870407).

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

It is not a de Polignac number, because 870405 - 2¹ = 870403 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28999 + ... + 29028.

It is an arithmetic number, because the mean of its divisors is an integer number (174084).

2⁸⁷⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

870405 is a deficient number, since it is larger than the sum of its proper divisors (522267).

870405 is a wasteful number, since it uses less digits than its factorization.

870405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58035.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 870405 is about 932.9549828368. The cubic root of 870405 is about 95.4788381791.

It can be divided in two parts, 870 and 405, that added together give a triangular number (1275 = T₅₀).

The spelling of 870405 in words is "eight hundred seventy thousand, four hundred five".