12489021 has 6 divisors (see below), whose sum is σ = 18039710. Its totient is φ = 8326008.

The previous prime is 12488941. The next prime is 12489047. The reversal of 12489021 is 12098421.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 168921 = 3510^2 + 411^2 .

It is not a de Polignac number, because 12489021 - 2¹⁴ = 12472637 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 (12489721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 693826 + ... + 693843.

Almost surely, 2^12489021 is an apocalyptic number.

It is an amenable number.

12489021 is a deficient number, since it is larger than the sum of its proper divisors (5550689).

12489021 is a wasteful number, since it uses less digits than its factorization.

12489021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387675 (or 1387672 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12489021 is about 3533.9808997786. The cubic root of 12489021 is about 232.0114751062.

The spelling of 12489021 in words is "twelve million, four hundred eighty-nine thousand, twenty-one".