9999743 has 8 divisors (see below), whose sum is σ = 10819200. Its totient is φ = 9187488.

The previous prime is 9999739. The next prime is 9999749. The reversal of 9999743 is 3479999.

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 9999743 - 2² = 9999739 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999691 and 9999700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999749) 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, 1298 + ... + 4656.

It is an arithmetic number, because the mean of its divisors is an integer number (1352400).

Almost surely, 2^9999743 is an apocalyptic number.

9999743 is a deficient number, since it is larger than the sum of its proper divisors (819457).

9999743 is a wasteful number, since it uses less digits than its factorization.

9999743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its digits is 551124, while the sum is 50.

The square root of 9999743 is about 3162.2370246394. The cubic root of 9999743 is about 215.4416233550.

The spelling of 9999743 in words is "nine million, nine hundred ninety-nine thousand, seven hundred forty-three".