99642 has 8 divisors (see below), whose sum is σ = 199296. Its totient is φ = 33212.

The previous prime is 99623. The next prime is 99643. The reversal of 99642 is 24699.

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

99642 is an admirable 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 (99643) by changing a digit.

99642 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 in 3 ways as a sum of consecutive naturals, for example, 8298 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (24912).

2⁹⁹⁶⁴² is an apocalyptic number.

99642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99648).

99642 is a wasteful number, since it uses less digits than its factorization.

99642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16612.

The product of its digits is 3888, while the sum is 30.

The square root of 99642 is about 315.6612107941. The cubic root of 99642 is about 46.3604324793.

It can be divided in two parts, 99 and 642, that added together give a triangular number (741 = T₃₈).

The spelling of 99642 in words is "ninety-nine thousand, six hundred forty-two".