12399531 has 8 divisors (see below), whose sum is σ = 16803984. Its totient is φ = 8130720.

The previous prime is 12399503. The next prime is 12399539. The reversal of 12399531 is 13599321.

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

It is not a de Polignac number, because 12399531 - 2¹³ = 12391339 is a prime.

It is a super-2 number, since 2×12399531² = 307496738039922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12399492 and 12399501.

It is not an unprimeable number, because it can be changed into a prime (12399539) 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, 33696 + ... + 34061.

It is an arithmetic number, because the mean of its divisors is an integer number (2100498).

Almost surely, 2^12399531 is an apocalyptic number.

12399531 is a deficient number, since it is larger than the sum of its proper divisors (4404453).

12399531 is an equidigital number, since it uses as much as digits as its factorization.

12399531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67821.

The product of its digits is 7290, while the sum is 33.

The square root of 12399531 is about 3521.2967781770. The cubic root of 12399531 is about 231.4559872914.

The spelling of 12399531 in words is "twelve million, three hundred ninety-nine thousand, five hundred thirty-one".