19999907 has 4 divisors (see below), whose sum is σ = 20009496. Its totient is φ = 19990320.

The previous prime is 19999897. The next prime is 19999909. The reversal of 19999907 is 70999991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70999991 = 2887 ⋅24593.

It is a cyclic number.

It is not a de Polignac number, because 19999907 - 2⁴ = 19999891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194 + ... + 6327.

It is an arithmetic number, because the mean of its divisors is an integer number (5002374).

Almost surely, 2^19999907 is an apocalyptic number.

19999907 is a deficient number, since it is larger than the sum of its proper divisors (9589).

19999907 is an equidigital number, since it uses as much as digits as its factorization.

19999907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9588.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 19999907 is about 4472.1255572714. The cubic root of 19999907 is about 271.4413409241.

The spelling of 19999907 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred seven".