19999874 has 4 divisors (see below), whose sum is σ = 29999814. Its totient is φ = 9999936.

The previous prime is 19999873. The next prime is 19999891. The reversal of 19999874 is 47899991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 8743849 = 3355^2 + 2957^2 .

It is not an unprimeable number, because it can be changed into a prime (19999873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999967 + ... + 4999970.

Almost surely, 2^19999874 is an apocalyptic number.

19999874 is a deficient number, since it is larger than the sum of its proper divisors (9999940).

19999874 is an equidigital number, since it uses as much as digits as its factorization.

19999874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9999939.

The product of its digits is 1469664, while the sum is 56.

The square root of 19999874 is about 4472.1218677491. The cubic root of 19999874 is about 271.4411916306.

It can be divided in two parts, 1999987 and 4, that added together give a palindrome (1999991).

The spelling of 19999874 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred seventy-four".