9999742 has 4 divisors (see below), whose sum is σ = 14999616. Its totient is φ = 4999870.

The previous prime is 9999739. The next prime is 9999749. The reversal of 9999742 is 2479999.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (9999749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499934 + ... + 2499937.

It is an arithmetic number, because the mean of its divisors is an integer number (3749904).

Almost surely, 2^9999742 is an apocalyptic number.

9999742 is a deficient number, since it is larger than the sum of its proper divisors (4999874).

9999742 is a wasteful number, since it uses less digits than its factorization.

9999742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999873.

The product of its digits is 367416, while the sum is 49.

The square root of 9999742 is about 3162.2368665234. The cubic root of 9999742 is about 215.4416161734.

The spelling of 9999742 in words is "nine million, nine hundred ninety-nine thousand, seven hundred forty-two".