19719874 has 4 divisors (see below), whose sum is σ = 29579814. Its totient is φ = 9859936.

The previous prime is 19719871. The next prime is 19719911. The reversal of 19719874 is 47891791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47891791 = 887 ⋅53993.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 5978025 = 3707^2 + 2445^2 .

It is not an unprimeable number, because it can be changed into a prime (19719871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4929967 + ... + 4929970.

Almost surely, 2^19719874 is an apocalyptic number.

19719874 is a deficient number, since it is larger than the sum of its proper divisors (9859940).

19719874 is an equidigital number, since it uses as much as digits as its factorization.

19719874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9859939.

The product of its digits is 127008, while the sum is 46.

The square root of 19719874 is about 4440.7064753257. The cubic root of 19719874 is about 270.1685002169.

The spelling of 19719874 in words is "nineteen million, seven hundred nineteen thousand, eight hundred seventy-four".