686190 has 32 divisors (see below), whose sum is σ = 1671840. Its totient is φ = 180224.

The previous prime is 686177. The next prime is 686197. The reversal of 686190 is 91686.

It is a super-2 number, since 2×686190² = 941713432200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686197) by changing a digit.

686190 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 2542 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (52245).

2⁶⁸⁶¹⁹⁰ is an apocalyptic number.

686190 is an abundant number, since it is smaller than the sum of its proper divisors (985650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686190 is a wasteful number, since it uses less digits than its factorization.

686190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 686190 is about 828.3658611990. The cubic root of 686190 is about 88.2026150880.

The spelling of 686190 in words is "six hundred eighty-six thousand, one hundred ninety".