19999975 has 6 divisors (see below), whose sum is σ = 24800000. Its totient is φ = 15999960.

The previous prime is 19999963. The next prime is 19999981. The reversal of 19999975 is 57999991.

It is not a de Polignac number, because 19999975 - 2²³ = 11611367 is a prime.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 399975 + ... + 400024.

Almost surely, 2^19999975 is an apocalyptic number.

19999975 is a deficient number, since it is larger than the sum of its proper divisors (4800025).

19999975 is an equidigital number, since it uses as much as digits as its factorization.

19999975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800009 (or 800004 counting only the distinct ones).

The product of its digits is 2066715, while the sum is 58.

The square root of 19999975 is about 4472.1331599137. The cubic root of 19999975 is about 271.4416485587.

It can be divided in two parts, 1999997 and 5, that added together give a palindrome (2000002).

The spelling of 19999975 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred seventy-five".