42120634 has 4 divisors (see below), whose sum is σ = 63180954. Its totient is φ = 21060316.

The previous prime is 42120623. The next prime is 42120647. The reversal of 42120634 is 43602124.

It is a happy number.

42120634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 40921609 + 1199025 = 6397^2 + 1095^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10530157 + ... + 10530160.

Almost surely, 2^42120634 is an apocalyptic number.

42120634 is a deficient number, since it is larger than the sum of its proper divisors (21060320).

42120634 is a wasteful number, since it uses less digits than its factorization.

42120634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21060319.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42120634 is about 6490.0411400853. The cubic root of 42120634 is about 347.9351455749.

Adding to 42120634 its reverse (43602124), we get a palindrome (85722758).

The spelling of 42120634 in words is "forty-two million, one hundred twenty thousand, six hundred thirty-four".