2989681 has 4 divisors (see below), whose sum is σ = 3001572. Its totient is φ = 2977792.

The previous prime is 2989673. The next prime is 2989691. The reversal of 2989681 is 1869892.

It is a happy number.

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 2611456 + 378225 = 1616^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2989681 - 2³ = 2989673 is a prime.

It is a super-2 number, since 2×2989681² = 17876384963522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2989621) 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, 5560 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (750393).

2^2989681 is an apocalyptic number.

It is an amenable number.

2989681 is a deficient number, since it is larger than the sum of its proper divisors (11891).

2989681 is a wasteful number, since it uses less digits than its factorization.

2989681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11890.

The product of its digits is 62208, while the sum is 43.

The square root of 2989681 is about 1729.0694028870. The cubic root of 2989681 is about 144.0594051452.

The spelling of 2989681 in words is "two million, nine hundred eighty-nine thousand, six hundred eighty-one".