42168506 has 4 divisors (see below), whose sum is σ = 63252762. Its totient is φ = 21084252.

The previous prime is 42168491. The next prime is 42168521. The reversal of 42168506 is 60586124.

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

It is an interprime number because it is at equal distance from previous prime (42168491) and next prime (42168521).

It can be written as a sum of positive squares in only one way, i.e., 32024281 + 10144225 = 5659^2 + 3185^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10542125 + ... + 10542128.

Almost surely, 2^42168506 is an apocalyptic number.

42168506 is a deficient number, since it is larger than the sum of its proper divisors (21084256).

42168506 is a wasteful number, since it uses less digits than its factorization.

42168506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084255.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42168506 is about 6493.7282049682. The cubic root of 42168506 is about 348.0669103297.

The spelling of 42168506 in words is "forty-two million, one hundred sixty-eight thousand, five hundred six".