863669 has 4 divisors (see below), whose sum is σ = 865920. Its totient is φ = 861420.

The previous prime is 863641. The next prime is 863671. The reversal of 863669 is 966368.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863669 is a prime.

It is a super-2 number, since 2×863669² = 1491848283122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863609) 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, 389 + ... + 1370.

It is an arithmetic number, because the mean of its divisors is an integer number (216480).

2⁸⁶³⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

863669 is a deficient number, since it is larger than the sum of its proper divisors (2251).

863669 is a wasteful number, since it uses less digits than its factorization.

863669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250.

The product of its digits is 46656, while the sum is 38.

The square root of 863669 is about 929.3379363827. The cubic root of 863669 is about 95.2318988389.

The spelling of 863669 in words is "eight hundred sixty-three thousand, six hundred sixty-nine".