42235906 has 4 divisors (see below), whose sum is σ = 63353862. Its totient is φ = 21117952.

The previous prime is 42235903. The next prime is 42235937. The reversal of 42235906 is 60953224.

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., 41152225 + 1083681 = 6415^2 + 1041^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (42235901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558975 + ... + 10558978.

Almost surely, 2^42235906 is an apocalyptic number.

42235906 is a deficient number, since it is larger than the sum of its proper divisors (21117956).

42235906 is a wasteful number, since it uses less digits than its factorization.

42235906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21117955.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 42235906 is about 6498.9157557242. The cubic root of 42235906 is about 348.2522557777.

The spelling of 42235906 in words is "forty-two million, two hundred thirty-five thousand, nine hundred six".