863690 has 8 divisors (see below), whose sum is σ = 1554660. Its totient is φ = 345472.

The previous prime is 863689. The next prime is 863693. The reversal of 863690 is 96368.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 840889 + 22801 = 917^2 + 151^2 .

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

It is a super-2 number, since 2×863690² = 1491920832200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (863693) by changing a digit.

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, 43175 + ... + 43194.

2⁸⁶³⁶⁹⁰ is an apocalyptic number.

863690 is a deficient number, since it is larger than the sum of its proper divisors (690970).

863690 is a wasteful number, since it uses less digits than its factorization.

863690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86376.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 863690 is about 929.3492346798. The cubic root of 863690 is about 95.2326706831.

The spelling of 863690 in words is "eight hundred sixty-three thousand, six hundred ninety".