2981989 has 4 divisors (see below), whose sum is σ = 2997324. Its totient is φ = 2966656.

The previous prime is 2981981. The next prime is 2981999. The reversal of 2981989 is 9891892.

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 2505889 + 476100 = 1583^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2981989 - 2³ = 2981981 is a prime.

It is a super-2 number, since 2×2981989² = 17784516792242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2981981) 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, 7372 + ... + 7765.

It is an arithmetic number, because the mean of its divisors is an integer number (749331).

2^2981989 is an apocalyptic number.

It is an amenable number.

2981989 is a deficient number, since it is larger than the sum of its proper divisors (15335).

2981989 is a wasteful number, since it uses less digits than its factorization.

2981989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15334.

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

The square root of 2981989 is about 1726.8436524480. The cubic root of 2981989 is about 143.9357513023.

Subtracting 2981989 from its reverse (9891892), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2981989 in words is "two million, nine hundred eighty-one thousand, nine hundred eighty-nine".