19988247 has 16 divisors (see below), whose sum is σ = 28229760. Its totient is φ = 12544992.

The previous prime is 19988237. The next prime is 19988257. The reversal of 19988247 is 74288991.

It is an interprime number because it is at equal distance from previous prime (19988237) and next prime (19988257).

It is not a de Polignac number, because 19988247 - 2⁶ = 19988183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19988196 and 19988205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8848 + ... + 10874.

It is an arithmetic number, because the mean of its divisors is an integer number (1764360).

Almost surely, 2^19988247 is an apocalyptic number.

19988247 is a deficient number, since it is larger than the sum of its proper divisors (8241513).

19988247 is a wasteful number, since it uses less digits than its factorization.

19988247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222.

The product of its digits is 290304, while the sum is 48.

The square root of 19988247 is about 4470.8217365491. The cubic root of 19988247 is about 271.3885803237.

The spelling of 19988247 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred forty-seven".