100042 has 4 divisors (see below), whose sum is σ = 150066. Its totient is φ = 50020.

The previous prime is 100019. The next prime is 100043. The reversal of 100042 is 240001.

100042 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240001 = 107 ⋅2243.

It can be written as a sum of positive squares in only one way, i.e., 77841 + 22201 = 279^2 + 149^2 .

It is a junction number, because it is equal to n+sod(n) for n = 99998 and 100034.

It is not an unprimeable number, because it can be changed into a prime (100043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25009 + ... + 25012.

2¹⁰⁰⁰⁴² is an apocalyptic number.

100042 is a deficient number, since it is larger than the sum of its proper divisors (50024).

100042 is an equidigital number, since it uses as much as digits as its factorization.

100042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50023.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 100042 is about 316.2941668763. The cubic root of 100042 is about 46.4223856510.

Adding to 100042 its reverse (240001), we get a palindrome (340043).

The spelling of 100042 in words is "one hundred thousand, forty-two", and thus it is an iban number.