12509999 has 8 divisors (see below), whose sum is σ = 13741440. Its totient is φ = 11335896.

The previous prime is 12509983. The next prime is 12510023. The reversal of 12509999 is 99990521.

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

It is a cyclic number.

It is not a de Polignac number, because 12509999 - 2⁴ = 12509983 is a prime.

It is a Duffinian number.

12509999 is a modest number, since divided by 9999 gives 1250 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509099) 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, 13877 + ... + 14750.

It is an arithmetic number, because the mean of its divisors is an integer number (1717680).

Almost surely, 2^12509999 is an apocalyptic number.

12509999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12509999 is a deficient number, since it is larger than the sum of its proper divisors (1231441).

12509999 is a wasteful number, since it uses less digits than its factorization.

12509999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28669.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 12509999 is about 3536.9476954007. The cubic root of 12509999 is about 232.1413068502.

The spelling of 12509999 in words is "twelve million, five hundred nine thousand, nine hundred ninety-nine".