12540989 has 2 divisors, whose sum is σ = 12540990. Its totient is φ = 12540988.

The previous prime is 12540973. The next prime is 12541027. The reversal of 12540989 is 98904521.

It is an a-pointer prime, because the next prime (12541027) can be obtained adding 12540989 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 80089 = 3530^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 12540989 - 2⁴ = 12540973 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 (12540389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6270494 + 6270495.

It is an arithmetic number, because the mean of its divisors is an integer number (6270495).

Almost surely, 2^12540989 is an apocalyptic number.

It is an amenable number.

12540989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12540989 is an equidigital number, since it uses as much as digits as its factorization.

12540989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 12540989 is about 3541.3258816438. The cubic root of 12540989 is about 232.3328370238.

It can be divided in two parts, 125 and 40989, that added together give a palindrome (41114).

The spelling of 12540989 in words is "twelve million, five hundred forty thousand, nine hundred eighty-nine".