2999981 has 4 divisors (see below), whose sum is σ = 3069792. Its totient is φ = 2930172.

The previous prime is 2999957. The next prime is 2999999. The reversal of 2999981 is 1899992.

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 2999981 - 2¹⁴ = 2983597 is a prime.

It is a super-2 number, since 2×2999981² = 17999772000722, 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 (2999911) 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, 34841 + ... + 34926.

It is an arithmetic number, because the mean of its divisors is an integer number (767448).

2^2999981 is an apocalyptic number.

It is an amenable number.

2999981 is a deficient number, since it is larger than the sum of its proper divisors (69811).

2999981 is an equidigital number, since it uses as much as digits as its factorization.

2999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69810.

The product of its digits is 104976, while the sum is 47.

The square root of 2999981 is about 1732.0453227326. The cubic root of 2999981 is about 144.2246525552.

The spelling of 2999981 in words is "two million, nine hundred ninety-nine thousand, nine hundred eighty-one".