999997743 has 4 divisors (see below), whose sum is σ = 1333330328. Its totient is φ = 666665160.

The previous prime is 999997717. The next prime is 999997769. The reversal of 999997743 is 347799999.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (999997717) and next prime (999997769).

It is not a de Polignac number, because 999997743 - 2⁶ = 999997679 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166666288 + ... + 166666293.

It is an arithmetic number, because the mean of its divisors is an integer number (333332582).

Almost surely, 2^999997743 is an apocalyptic number.

999997743 is a deficient number, since it is larger than the sum of its proper divisors (333332585).

999997743 is a wasteful number, since it uses less digits than its factorization.

999997743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333332584.

The product of its digits is 34720812, while the sum is 66.

The square root of 999997743 is about 31622.7409153603. The cubic root of 999997743 is about 999.9992476661. Note that the first 3 decimals are identical.

The spelling of 999997743 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred forty-three".