12401999 has 4 divisors (see below), whose sum is σ = 12441936. Its totient is φ = 12362064.

The previous prime is 12401989. The next prime is 12402007. The reversal of 12401999 is 99910421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12401999 - 2⁸ = 12401743 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 (12401929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19499 + ... + 20124.

It is an arithmetic number, because the mean of its divisors is an integer number (3110484).

Almost surely, 2^12401999 is an apocalyptic number.

12401999 is a deficient number, since it is larger than the sum of its proper divisors (39937).

12401999 is an equidigital number, since it uses as much as digits as its factorization.

12401999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39936.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 12401999 is about 3521.6471998200. The cubic root of 12401999 is about 231.4713425894.

The spelling of 12401999 in words is "twelve million, four hundred one thousand, nine hundred ninety-nine".