42172908 has 12 divisors (see below), whose sum is σ = 98403480. Its totient is φ = 14057632.

The previous prime is 42172891. The next prime is 42172909. The reversal of 42172908 is 80927124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (42172909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1757193 + ... + 1757216.

It is an arithmetic number, because the mean of its divisors is an integer number (8200290).

Almost surely, 2^42172908 is an apocalyptic number.

It is an amenable number.

42172908 is an abundant number, since it is smaller than the sum of its proper divisors (56230572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42172908 is a wasteful number, since it uses less digits than its factorization.

42172908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514416 (or 3514414 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 42172908 is about 6494.0671385504. The cubic root of 42172908 is about 348.0790215582.

The spelling of 42172908 in words is "forty-two million, one hundred seventy-two thousand, nine hundred eight".