19247985 has 12 divisors (see below), whose sum is σ = 33363252. Its totient is φ = 10265568.

The previous prime is 19247953. The next prime is 19247989. The reversal of 19247985 is 58974291.

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 16136289 = 1764^2 + 4017^2 .

It is not a de Polignac number, because 19247985 - 2⁵ = 19247953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 427733 = 19247985 / (1 + 9 + 2 + 4 + 7 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 19247985.

It is not an unprimeable number, because it can be changed into a prime (19247989) 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 11 ways as a sum of consecutive naturals, for example, 213822 + ... + 213911.

It is an arithmetic number, because the mean of its divisors is an integer number (2780271).

Almost surely, 2^19247985 is an apocalyptic number.

19247985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19247985 is a deficient number, since it is larger than the sum of its proper divisors (14115267).

19247985 is a wasteful number, since it uses less digits than its factorization.

19247985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427744 (or 427741 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19247985 is about 4387.2525571250. The cubic root of 19247985 is about 267.9960690372.

It can be divided in two parts, 19 and 247985, that added together give a square (248004 = 498²).

The spelling of 19247985 in words is "nineteen million, two hundred forty-seven thousand, nine hundred eighty-five".