19911742 has 8 divisors (see below), whose sum is σ = 30357432. Its totient is φ = 9792600.

The previous prime is 19911739. The next prime is 19911757. The reversal of 19911742 is 24711991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 19911698 and 19911707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81484 + ... + 81727.

It is an arithmetic number, because the mean of its divisors is an integer number (3794679).

Almost surely, 2^19911742 is an apocalyptic number.

19911742 is a deficient number, since it is larger than the sum of its proper divisors (10445690).

19911742 is a wasteful number, since it uses less digits than its factorization.

19911742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163274.

The product of its digits is 4536, while the sum is 34.

The square root of 19911742 is about 4462.2575004139. The cubic root of 19911742 is about 271.0418911018.

The spelling of 19911742 in words is "nineteen million, nine hundred eleven thousand, seven hundred forty-two".