2047681 has 4 divisors (see below), whose sum is σ = 2052864. Its totient is φ = 2042500.

The previous prime is 2047651. The next prime is 2047699. The reversal of 2047681 is 1867402.

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.

It is a cyclic number.

It is not a de Polignac number, because 2047681 - 2⁷ = 2047553 is a prime.

It is a super-2 number, since 2×2047681² = 8385994955522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2047651) 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, 1945 + ... + 2806.

It is an arithmetic number, because the mean of its divisors is an integer number (513216).

2^2047681 is an apocalyptic number.

It is an amenable number.

2047681 is a deficient number, since it is larger than the sum of its proper divisors (5183).

2047681 is an equidigital number, since it uses as much as digits as its factorization.

2047681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2047681 is about 1430.9720472462. The cubic root of 2047681 is about 126.9854903133.

The spelling of 2047681 in words is "two million, forty-seven thousand, six hundred eighty-one".