105404042 has 4 divisors (see below), whose sum is σ = 158106066. Its totient is φ = 52702020.

The previous prime is 105404023. The next prime is 105404087. The reversal of 105404042 is 240404501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240404501 = 613 ⋅392177.

It can be written as a sum of positive squares in only one way, i.e., 82065481 + 23338561 = 9059^2 + 4831^2 .

It is a super-2 number, since 2×105404042² = 22220024139875528, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26351009 + ... + 26351012.

Almost surely, 2^105404042 is an apocalyptic number.

105404042 is a deficient number, since it is larger than the sum of its proper divisors (52702024).

105404042 is an equidigital number, since it uses as much as digits as its factorization.

105404042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52702023.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 105404042 is about 10266.6470670809. The cubic root of 105404042 is about 472.3737493847.

Adding to 105404042 its reverse (240404501), we get a palindrome (345808543).

The spelling of 105404042 in words is "one hundred five million, four hundred four thousand, forty-two".