19938947 has 4 divisors (see below), whose sum is σ = 22787376. Its totient is φ = 17090520.

The previous prime is 19938911. The next prime is 19938949. The reversal of 19938947 is 74983991.

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 19938947 - 2⁶ = 19938883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19938895 and 19938904.

It is not an unprimeable number, because it can be changed into a prime (19938949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1424204 + ... + 1424217.

It is an arithmetic number, because the mean of its divisors is an integer number (5696844).

Almost surely, 2^19938947 is an apocalyptic number.

19938947 is a deficient number, since it is larger than the sum of its proper divisors (2848429).

19938947 is an equidigital number, since it uses as much as digits as its factorization.

19938947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848428.

The product of its digits is 489888, while the sum is 50.

The square root of 19938947 is about 4465.3048048258. The cubic root of 19938947 is about 271.1652745643.

The spelling of 19938947 in words is "nineteen million, nine hundred thirty-eight thousand, nine hundred forty-seven".