861658 has 8 divisors (see below), whose sum is σ = 1477152. Its totient is φ = 369276.

The previous prime is 861647. The next prime is 861659. The reversal of 861658 is 856168.

It is a happy number.

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

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (861659) 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, 30760 + ... + 30787.

It is an arithmetic number, because the mean of its divisors is an integer number (184644).

2⁸⁶¹⁶⁵⁸ is an apocalyptic number.

861658 is a deficient number, since it is larger than the sum of its proper divisors (615494).

861658 is a wasteful number, since it uses less digits than its factorization.

861658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61556.

The product of its digits is 11520, while the sum is 34.

The square root of 861658 is about 928.2553527990. The cubic root of 861658 is about 95.1579275290.

The spelling of 861658 in words is "eight hundred sixty-one thousand, six hundred fifty-eight".