12509391 has 8 divisors (see below), whose sum is σ = 17557120. Its totient is φ = 7900632.

The previous prime is 12509389. The next prime is 12509423. The reversal of 12509391 is 19390521.

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

It is not a de Polignac number, because 12509391 - 2¹ = 12509389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509351) 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, 109675 + ... + 109788.

It is an arithmetic number, because the mean of its divisors is an integer number (2194640).

Almost surely, 2^12509391 is an apocalyptic number.

12509391 is a deficient number, since it is larger than the sum of its proper divisors (5047729).

12509391 is a wasteful number, since it uses less digits than its factorization.

12509391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219485.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 12509391 is about 3536.8617445413. The cubic root of 12509391 is about 232.1375460132.

The spelling of 12509391 in words is "twelve million, five hundred nine thousand, three hundred ninety-one".