19943019 has 12 divisors (see below), whose sum is σ = 29237416. Its totient is φ = 13096512.

The previous prime is 19943017. The next prime is 19943051. The reversal of 19943019 is 91034991.

It is not a de Polignac number, because 19943019 - 2¹ = 19943017 is a prime.

It is a super-2 number, since 2×19943019² = 795448013668722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19943017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15934 + ... + 17139.

Almost surely, 2^19943019 is an apocalyptic number.

19943019 is a deficient number, since it is larger than the sum of its proper divisors (9294397).

19943019 is a wasteful number, since it uses less digits than its factorization.

19943019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33146 (or 33143 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 19943019 is about 4465.7607414639. The cubic root of 19943019 is about 271.1837327413.

The spelling of 19943019 in words is "nineteen million, nine hundred forty-three thousand, nineteen".