19939845 has 16 divisors (see below), whose sum is σ = 32025600. Its totient is φ = 10593984.

The previous prime is 19939811. The next prime is 19939879. The reversal of 19939845 is 54893991.

It is an interprime number because it is at equal distance from previous prime (19939811) and next prime (19939879).

It is a de Polignac number, because none of the positive numbers 2^k-19939845 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19939794 and 19939803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1756 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (2001600).

Almost surely, 2^19939845 is an apocalyptic number.

19939845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19939845 is a deficient number, since it is larger than the sum of its proper divisors (12085755).

19939845 is a wasteful number, since it uses less digits than its factorization.

19939845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5084.

The product of its digits is 349920, while the sum is 48.

The square root of 19939845 is about 4465.4053567397. The cubic root of 19939845 is about 271.1693453704.

The spelling of 19939845 in words is "nineteen million, nine hundred thirty-nine thousand, eight hundred forty-five".