99742 has 4 divisors (see below), whose sum is σ = 149616. Its totient is φ = 49870.

The previous prime is 99733. The next prime is 99761. The reversal of 99742 is 24799.

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

It is a Smith number, since the sum of its digits (31) 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 an unprimeable number.

99742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24934 + ... + 24937.

It is an arithmetic number, because the mean of its divisors is an integer number (37404).

2⁹⁹⁷⁴² is an apocalyptic number.

99742 is a deficient number, since it is larger than the sum of its proper divisors (49874).

99742 is a wasteful number, since it uses less digits than its factorization.

99742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49873.

The product of its digits is 4536, while the sum is 31.

The square root of 99742 is about 315.8195687414. The cubic root of 99742 is about 46.3759362937.

It can be divided in two parts, 99 and 742, that added together give a square (841 = 29²).

The spelling of 99742 in words is "ninety-nine thousand, seven hundred forty-two".