863405 has 4 divisors (see below), whose sum is σ = 1036092. Its totient is φ = 690720.

The previous prime is 863393. The next prime is 863479. The reversal of 863405 is 504368.

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

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 619369 = 494^2 + 787^2 .

It is not a de Polignac number, because 863405 - 2¹⁶ = 797869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86336 + ... + 86345.

It is an arithmetic number, because the mean of its divisors is an integer number (259023).

2⁸⁶³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

863405 is a deficient number, since it is larger than the sum of its proper divisors (172687).

863405 is a wasteful number, since it uses less digits than its factorization.

863405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172686.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 863405 is about 929.1958889276. The cubic root of 863405 is about 95.2221945875. Note that the first 3 decimals are identical.

The spelling of 863405 in words is "eight hundred sixty-three thousand, four hundred five".