2356861 has 4 divisors (see below), whose sum is σ = 2538172. Its totient is φ = 2175552.

The previous prime is 2356843. The next prime is 2356867. The reversal of 2356861 is 1686532.

2356861 is nontrivially palindromic in base 6.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1425636 + 931225 = 1194^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 2356861 - 2⁹ = 2356349 is a prime.

2356861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2356867) 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, 90636 + ... + 90661.

It is an arithmetic number, because the mean of its divisors is an integer number (634543).

2^2356861 is an apocalyptic number.

It is an amenable number.

2356861 is a deficient number, since it is larger than the sum of its proper divisors (181311).

2356861 is a wasteful number, since it uses less digits than its factorization.

2356861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181310.

The product of its digits is 8640, while the sum is 31.

The square root of 2356861 is about 1535.2071521459. The cubic root of 2356861 is about 133.0795499001.

The spelling of 2356861 in words is "two million, three hundred fifty-six thousand, eight hundred sixty-one".