2147989 has 2 divisors, whose sum is σ = 2147990. Its totient is φ = 2147988.

The previous prime is 2147987. The next prime is 2148011. The reversal of 2147989 is 9897412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 1764 = 1465^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 2147989 - 2¹ = 2147987 is a prime.

It is a super-2 number, since 2×2147989² = 9227713488242, which contains 22 as substring.

Together with 2147987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2147987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073994 + 1073995.

It is an arithmetic number, because the mean of its divisors is an integer number (1073995).

2^2147989 is an apocalyptic number.

It is an amenable number.

2147989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147989 is an equidigital number, since it uses as much as digits as its factorization.

2147989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 2147989 is about 1465.6019241254. The cubic root of 2147989 is about 129.0260348470.

It can be divided in two parts, 2147 and 989, that added together give a square (3136 = 56²).

The spelling of 2147989 in words is "two million, one hundred forty-seven thousand, nine hundred eighty-nine".