2987989 has 2 divisors, whose sum is σ = 2987990. Its totient is φ = 2987988.

The previous prime is 2987983. The next prime is 2988019. The reversal of 2987989 is 9897892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2007889 + 980100 = 1417^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2987989 - 2⁹ = 2987477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2987983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1493994 + 1493995.

It is an arithmetic number, because the mean of its divisors is an integer number (1493995).

2^2987989 is an apocalyptic number.

It is an amenable number.

2987989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2987989 is an equidigital number, since it uses as much as digits as its factorization.

2987989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 52.

The square root of 2987989 is about 1728.5800531072. The cubic root of 2987989 is about 144.0322233700.

Subtracting 2987989 from its reverse (9897892), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2987989 in words is "two million, nine hundred eighty-seven thousand, nine hundred eighty-nine".