2660989 has 2 divisors, whose sum is σ = 2660990. Its totient is φ = 2660988.

The previous prime is 2660963. The next prime is 2661013. The reversal of 2660989 is 9890662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 116964 = 1595^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660989 - 2¹¹ = 2658941 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2660089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330494 + 1330495.

It is an arithmetic number, because the mean of its divisors is an integer number (1330495).

2^2660989 is an apocalyptic number.

It is an amenable number.

2660989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660989 is an equidigital number, since it uses as much as digits as its factorization.

2660989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 2660989 is about 1631.2538122561. The cubic root of 2660989 is about 138.5737680852.

The spelling of 2660989 in words is "two million, six hundred sixty thousand, nine hundred eighty-nine".