19913743 has 8 divisors (see below), whose sum is σ = 20571408. Its totient is φ = 19266624.

The previous prime is 19913737. The next prime is 19913779. The reversal of 19913743 is 34731991.

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

It is a cyclic number.

It is not a de Polignac number, because 19913743 - 2¹⁷ = 19782671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19913713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296 + ... + 6442.

It is an arithmetic number, because the mean of its divisors is an integer number (2571426).

Almost surely, 2^19913743 is an apocalyptic number.

19913743 is a deficient number, since it is larger than the sum of its proper divisors (657665).

19913743 is an equidigital number, since it uses as much as digits as its factorization.

19913743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5273.

The product of its digits is 20412, while the sum is 37.

The square root of 19913743 is about 4462.4817086460. The cubic root of 19913743 is about 271.0509701108.

The spelling of 19913743 in words is "nineteen million, nine hundred thirteen thousand, seven hundred forty-three".