1178861 has 4 divisors (see below), whose sum is σ = 1181052. Its totient is φ = 1176672.

The previous prime is 1178851. The next prime is 1178887. The reversal of 1178861 is 1688711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1688711 = 139 ⋅12149.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 481636 = 835^2 + 694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1178861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335 + ... + 1571.

It is an arithmetic number, because the mean of its divisors is an integer number (295263).

2^1178861 is an apocalyptic number.

It is an amenable number.

1178861 is a deficient number, since it is larger than the sum of its proper divisors (2191).

1178861 is an equidigital number, since it uses as much as digits as its factorization.

1178861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190.

The product of its digits is 2688, while the sum is 32.

The square root of 1178861 is about 1085.7536553012. The cubic root of 1178861 is about 105.6381694071.

The spelling of 1178861 in words is "one million, one hundred seventy-eight thousand, eight hundred sixty-one".