2347981 has 2 divisors, whose sum is σ = 2347982. Its totient is φ = 2347980.

The previous prime is 2347957. The next prime is 2347991. The reversal of 2347981 is 1897432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 401956 = 1395^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 2347981 - 2⁵ = 2347949 is a prime.

It is a super-3 number, since 3×2347981³ = 38833361842844631423, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2347931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1173990 + 1173991.

It is an arithmetic number, because the mean of its divisors is an integer number (1173991).

2^2347981 is an apocalyptic number.

It is an amenable number.

2347981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2347981 is an equidigital number, since it uses as much as digits as its factorization.

2347981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 2347981 is about 1532.3123049822. The cubic root of 2347981 is about 132.9122039144.

The spelling of 2347981 in words is "two million, three hundred forty-seven thousand, nine hundred eighty-one".