19491914 has 16 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 8868720.

The previous prime is 19491893. The next prime is 19491917. The reversal of 19491914 is 41919491.

It is a super-2 number, since 2×19491914² = 759869422766792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19491917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3434 + ... + 7125.

It is an arithmetic number, because the mean of its divisors is an integer number (1995840).

Almost surely, 2^19491914 is an apocalyptic number.

19491914 is a deficient number, since it is larger than the sum of its proper divisors (12441526).

19491914 is a wasteful number, since it uses less digits than its factorization.

19491914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10645.

The product of its digits is 11664, while the sum is 38.

The square root of 19491914 is about 4414.9647790215. The cubic root of 19491914 is about 269.1234214803.

The spelling of 19491914 in words is "nineteen million, four hundred ninety-one thousand, nine hundred fourteen".