861958 has 4 divisors (see below), whose sum is σ = 1292940. Its totient is φ = 430978.

The previous prime is 861947. The next prime is 861977. The reversal of 861958 is 859168.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

861958 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215488 + ... + 215491.

It is an arithmetic number, because the mean of its divisors is an integer number (323235).

2⁸⁶¹⁹⁵⁸ is an apocalyptic number.

861958 is a deficient number, since it is larger than the sum of its proper divisors (430982).

861958 is a wasteful number, since it uses less digits than its factorization.

861958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430981.

The product of its digits is 17280, while the sum is 37.

The square root of 861958 is about 928.4169322023. The cubic root of 861958 is about 95.1689698318.

The spelling of 861958 in words is "eight hundred sixty-one thousand, nine hundred fifty-eight".