12507989 has 8 divisors (see below), whose sum is σ = 13691832. Its totient is φ = 11355840.

The previous prime is 12507977. The next prime is 12507997. The reversal of 12507989 is 98970521.

It can be written as a sum of positive squares in 4 ways, for example, as 47089 + 12460900 = 217^2 + 3530^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12507989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12507959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7094 + ... + 8679.

It is an arithmetic number, because the mean of its divisors is an integer number (1711479).

Almost surely, 2^12507989 is an apocalyptic number.

It is an amenable number.

12507989 is a deficient number, since it is larger than the sum of its proper divisors (1183843).

12507989 is a wasteful number, since it uses less digits than its factorization.

12507989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15847.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 12507989 is about 3536.6635406835. The cubic root of 12507989 is about 232.1288733555.

The spelling of 12507989 in words is "twelve million, five hundred seven thousand, nine hundred eighty-nine".