2707981 has 4 divisors (see below), whose sum is σ = 2867292. Its totient is φ = 2548672.

The previous prime is 2707979. The next prime is 2707987. The reversal of 2707981 is 1897072.

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 1822500 + 885481 = 1350^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 2707981 - 2¹ = 2707979 is a prime.

It is a super-2 number, since 2×2707981² = 14666322192722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2707987) 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, 79630 + ... + 79663.

It is an arithmetic number, because the mean of its divisors is an integer number (716823).

2^2707981 is an apocalyptic number.

It is an amenable number.

2707981 is a deficient number, since it is larger than the sum of its proper divisors (159311).

2707981 is a wasteful number, since it uses less digits than its factorization.

2707981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159310.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 2707981 is about 1645.5944214781. The cubic root of 2707981 is about 139.3847319714.

The spelling of 2707981 in words is "two million, seven hundred seven thousand, nine hundred eighty-one".