2899981 has 4 divisors (see below), whose sum is σ = 3314272. Its totient is φ = 2485692.

The previous prime is 2899943. The next prime is 2899991. The reversal of 2899981 is 1899982.

It is a happy number.

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 2899981 - 2¹¹ = 2897933 is a prime.

It is a super-2 number, since 2×2899981² = 16819779600722, 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 (2899921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207135 + ... + 207148.

It is an arithmetic number, because the mean of its divisors is an integer number (828568).

2^2899981 is an apocalyptic number.

It is an amenable number.

2899981 is a deficient number, since it is larger than the sum of its proper divisors (414291).

2899981 is an equidigital number, since it uses as much as digits as its factorization.

2899981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414290.

The product of its digits is 93312, while the sum is 46.

The square root of 2899981 is about 1702.9330579914. The cubic root of 2899981 is about 142.6040032789.

Subtracting from 2899981 its reverse (1899982), we obtain a palindrome (999999).

The spelling of 2899981 in words is "two million, eight hundred ninety-nine thousand, nine hundred eighty-one".