19999959 has 8 divisors (see below), whose sum is σ = 30476160. Its totient is φ = 11428536.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999959 is 95999991.

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

It is not a de Polignac number, because 19999959 - 2⁵ = 19999927 is a prime.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476169 + ... + 476210.

It is an arithmetic number, because the mean of its divisors is an integer number (3809520).

Almost surely, 2^19999959 is an apocalyptic number.

19999959 is a deficient number, since it is larger than the sum of its proper divisors (10476201).

19999959 is an equidigital number, since it uses as much as digits as its factorization.

19999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952389.

The product of its digits is 2657205, while the sum is 60.

The square root of 19999959 is about 4472.1313710579. The cubic root of 19999959 is about 271.4415761742.

The spelling of 19999959 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred fifty-nine".