19944019 has 4 divisors (see below), whose sum is σ = 19979640. Its totient is φ = 19908400.

The previous prime is 19944007. The next prime is 19944037. The reversal of 19944019 is 91044991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19944019 is a prime.

It is a super-2 number, since 2×19944019² = 795527787744722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19944719) 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, 16957 + ... + 18094.

It is an arithmetic number, because the mean of its divisors is an integer number (4994910).

Almost surely, 2^19944019 is an apocalyptic number.

19944019 is a deficient number, since it is larger than the sum of its proper divisors (35621).

19944019 is an equidigital number, since it uses as much as digits as its factorization.

19944019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35620.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 19944019 is about 4465.8727030671. The cubic root of 19944019 is about 271.1882653082.

The spelling of 19944019 in words is "nineteen million, nine hundred forty-four thousand, nineteen".