17640242 has 4 divisors (see below), whose sum is σ = 26460366. Its totient is φ = 8820120.

The previous prime is 17640221. The next prime is 17640247. The reversal of 17640242 is 24204671.

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., 16638241 + 1002001 = 4079^2 + 1001^2 .

It is a super-2 number, since 2×17640242² = 622356275637128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17640247) by changing a digit.

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, 4410059 + ... + 4410062.

Almost surely, 2^17640242 is an apocalyptic number.

17640242 is a deficient number, since it is larger than the sum of its proper divisors (8820124).

17640242 is an equidigital number, since it uses as much as digits as its factorization.

17640242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8820123.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 17640242 is about 4200.0288094250. The cubic root of 17640242 is about 260.3163899817.

The spelling of 17640242 in words is "seventeen million, six hundred forty thousand, two hundred forty-two".