2747981 has 4 divisors (see below), whose sum is σ = 2751552. Its totient is φ = 2744412.

The previous prime is 2747977. The next prime is 2748013. The reversal of 2747981 is 1897472.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2747981 - 2² = 2747977 is a prime.

It is a super-2 number, since 2×2747981² = 15102799152722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2747911) 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 in 3 ways as a sum of consecutive naturals, for example, 101 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (687888).

2^2747981 is an apocalyptic number.

It is an amenable number.

2747981 is a deficient number, since it is larger than the sum of its proper divisors (3571).

2747981 is a wasteful number, since it uses less digits than its factorization.

2747981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570.

The product of its digits is 28224, while the sum is 38.

The square root of 2747981 is about 1657.7035319984. The cubic root of 2747981 is about 140.0676713663.

The spelling of 2747981 in words is "two million, seven hundred forty-seven thousand, nine hundred eighty-one".