19947794 has 4 divisors (see below), whose sum is σ = 29921694. Its totient is φ = 9973896.

The previous prime is 19947757. The next prime is 19947797. The reversal of 19947794 is 49774991.

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., 19035769 + 912025 = 4363^2 + 955^2 .

It is not an unprimeable number, because it can be changed into a prime (19947797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986947 + ... + 4986950.

Almost surely, 2^19947794 is an apocalyptic number.

19947794 is a deficient number, since it is larger than the sum of its proper divisors (9973900).

19947794 is an equidigital number, since it uses as much as digits as its factorization.

19947794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9973899.

The product of its digits is 571536, while the sum is 50.

The square root of 19947794 is about 4466.2953328234. The cubic root of 19947794 is about 271.2053743826.

The spelling of 19947794 in words is "nineteen million, nine hundred forty-seven thousand, seven hundred ninety-four".