42252178 has 4 divisors (see below), whose sum is σ = 63378270. Its totient is φ = 21126088.

The previous prime is 42252151. The next prime is 42252179. The reversal of 42252178 is 87125224.

It is a happy number.

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., 36929929 + 5322249 = 6077^2 + 2307^2 .

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 (42252179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563043 + ... + 10563046.

Almost surely, 2^42252178 is an apocalyptic number.

42252178 is a deficient number, since it is larger than the sum of its proper divisors (21126092).

42252178 is a wasteful number, since it uses less digits than its factorization.

42252178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21126091.

The product of its digits is 8960, while the sum is 31.

The square root of 42252178 is about 6500.1675363024. The cubic root of 42252178 is about 348.2969731258.

The spelling of 42252178 in words is "forty-two million, two hundred fifty-two thousand, one hundred seventy-eight".