19944959 has 4 divisors (see below), whose sum is σ = 19968480. Its totient is φ = 19921440.

The previous prime is 19944943. The next prime is 19944973. The reversal of 19944959 is 95944991.

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 19944959 - 2⁴ = 19944943 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 (19944259) 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, 10439 + ... + 12200.

It is an arithmetic number, because the mean of its divisors is an integer number (4992120).

Almost surely, 2^19944959 is an apocalyptic number.

19944959 is a deficient number, since it is larger than the sum of its proper divisors (23521).

19944959 is an equidigital number, since it uses as much as digits as its factorization.

19944959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23520.

The product of its digits is 524880, while the sum is 50.

The square root of 19944959 is about 4465.9779444149. The cubic root of 19944959 is about 271.1925257829.

The spelling of 19944959 in words is "nineteen million, nine hundred forty-four thousand, nine hundred fifty-nine".