863990 has 8 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 345592.

The previous prime is 863983. The next prime is 864007. The reversal of 863990 is 99368.

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

It is a self number, because there is not a number n which added to its sum of digits gives 863990.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43190 + ... + 43209.

It is an arithmetic number, because the mean of its divisors is an integer number (194400).

2⁸⁶³⁹⁹⁰ is an apocalyptic number.

863990 is a deficient number, since it is larger than the sum of its proper divisors (691210).

863990 is a wasteful number, since it uses less digits than its factorization.

863990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86406.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 863990 is about 929.5106239307. The cubic root of 863990 is about 95.2436956627.

Subtracting from 863990 its sum of digits (35), we obtain a triangular number (863955 = T₁₃₁₄).

The spelling of 863990 in words is "eight hundred sixty-three thousand, nine hundred ninety".