863215 has 4 divisors (see below), whose sum is σ = 1035864. Its totient is φ = 690568.

The previous prime is 863197. The next prime is 863231. The reversal of 863215 is 512368.

It is a happy number.

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 863215 - 2⁷ = 863087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 863215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86317 + ... + 86326.

It is an arithmetic number, because the mean of its divisors is an integer number (258966).

2⁸⁶³²¹⁵ is an apocalyptic number.

863215 is a deficient number, since it is larger than the sum of its proper divisors (172649).

863215 is a wasteful number, since it uses less digits than its factorization.

863215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172648.

The product of its digits is 1440, while the sum is 25.

The square root of 863215 is about 929.0936443653. The cubic root of 863215 is about 95.2152092429.

The spelling of 863215 in words is "eight hundred sixty-three thousand, two hundred fifteen".