17420042 has 4 divisors (see below), whose sum is σ = 26130066. Its totient is φ = 8710020.

The previous prime is 17420021. The next prime is 17420057. The reversal of 17420042 is 24002471.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24002471 = 43 ⋅558197.

It can be written as a sum of positive squares in only one way, i.e., 17397241 + 22801 = 4171^2 + 151^2 .

It is a junction number, because it is equal to n+sod(n) for n = 17419996 and 17420023.

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, 4355009 + ... + 4355012.

Almost surely, 2^17420042 is an apocalyptic number.

17420042 is a deficient number, since it is larger than the sum of its proper divisors (8710024).

17420042 is an equidigital number, since it uses as much as digits as its factorization.

17420042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8710023.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 17420042 is about 4173.7323824127. The cubic root of 17420042 is about 259.2286904462.

The spelling of 17420042 in words is "seventeen million, four hundred twenty thousand, forty-two".