102842 has 4 divisors (see below), whose sum is σ = 154266. Its totient is φ = 51420.

The previous prime is 102841. The next prime is 102859. The reversal of 102842 is 248201.

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

It can be written as a sum of positive squares in only one way, i.e., 83521 + 19321 = 289^2 + 139^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 102842.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 102842.

It is not an unprimeable number, because it can be changed into a prime (102841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25709 + ... + 25712.

2¹⁰²⁸⁴² is an apocalyptic number.

102842 is a deficient number, since it is larger than the sum of its proper divisors (51424).

102842 is an equidigital number, since it uses as much as digits as its factorization.

102842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51423.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 102842 is about 320.6898813496. The cubic root of 102842 is about 46.8515005175.

The spelling of 102842 in words is "one hundred two thousand, eight hundred forty-two".