260420989 has 2 divisors, whose sum is σ = 260420990. Its totient is φ = 260420988.

The previous prime is 260420981. The next prime is 260421013. The reversal of 260420989 is 989024062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145395364 + 115025625 = 12058^2 + 10725^2 .

It is a cyclic number.

It is not a de Polignac number, because 260420989 - 2³ = 260420981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260420981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130210494 + 130210495.

It is an arithmetic number, because the mean of its divisors is an integer number (130210495).

Almost surely, 2^260420989 is an apocalyptic number.

It is an amenable number.

260420989 is a deficient number, since it is larger than the sum of its proper divisors (1).

260420989 is an equidigital number, since it uses as much as digits as its factorization.

260420989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 260420989 is about 16137.5645312420. The cubic root of 260420989 is about 638.5947267029.

The spelling of 260420989 in words is "two hundred sixty million, four hundred twenty thousand, nine hundred eighty-nine".