19928943 has 8 divisors (see below), whose sum is σ = 29524400. Its totient is φ = 13285944.

The previous prime is 19928921. The next prime is 19928959. The reversal of 19928943 is 34982991.

It is not a de Polignac number, because 19928943 - 2⁸ = 19928687 is a prime.

It is a super-3 number, since 3×19928943³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928983) 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, 369028 + ... + 369081.

It is an arithmetic number, because the mean of its divisors is an integer number (3690550).

Almost surely, 2^19928943 is an apocalyptic number.

19928943 is a deficient number, since it is larger than the sum of its proper divisors (9595457).

19928943 is an equidigital number, since it uses as much as digits as its factorization.

19928943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738118 (or 738112 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 19928943 is about 4464.1844719949. The cubic root of 19928943 is about 271.1199162476.

The spelling of 19928943 in words is "nineteen million, nine hundred twenty-eight thousand, nine hundred forty-three".