42168634 has 4 divisors (see below), whose sum is σ = 63252954. Its totient is φ = 21084316.

The previous prime is 42168617. The next prime is 42168671. The reversal of 42168634 is 43686124.

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., 37173409 + 4995225 = 6097^2 + 2235^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42168634.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10542157 + ... + 10542160.

Almost surely, 2^42168634 is an apocalyptic number.

42168634 is a deficient number, since it is larger than the sum of its proper divisors (21084320).

42168634 is a wasteful number, since it uses less digits than its factorization.

42168634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21084319.

The product of its digits is 27648, while the sum is 34.

The square root of 42168634 is about 6493.7380606243. The cubic root of 42168634 is about 348.0672625082.

The spelling of 42168634 in words is "forty-two million, one hundred sixty-eight thousand, six hundred thirty-four".