861916 has 24 divisors (see below), whose sum is σ = 1733760. Its totient is φ = 370800.

The previous prime is 861907. The next prime is 861929. The reversal of 861916 is 619168.

861916 = T₁₁₁ + T₁₁₂ + ... + T₁₈₆.

It is a happy number.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 321 + ... + 1351.

It is an arithmetic number, because the mean of its divisors is an integer number (72240).

2⁸⁶¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

861916 is an abundant number, since it is smaller than the sum of its proper divisors (871844).

It is a weird number, because it is abundant, but not a pseudoperfect number.

861916 is a wasteful number, since it uses less digits than its factorization.

861916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1063 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 861916 is about 928.3943127788. The cubic root of 861916 is about 95.1674240637.

It can be divided in two parts, 86 and 1916, that added together give a palindrome (2002).

The spelling of 861916 in words is "eight hundred sixty-one thousand, nine hundred sixteen".