42164872 has 8 divisors (see below), whose sum is σ = 79059150. Its totient is φ = 21082432.

The previous prime is 42164849. The next prime is 42164891. The reversal of 42164872 is 27846124.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 12068676 = 5486^2 + 3474^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2635297 + ... + 2635312.

Almost surely, 2^42164872 is an apocalyptic number.

It is an amenable number.

42164872 is a deficient number, since it is larger than the sum of its proper divisors (36894278).

42164872 is a wasteful number, since it uses less digits than its factorization.

42164872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270615 (or 5270611 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 42164872 is about 6493.4483904933. The cubic root of 42164872 is about 348.0569114656.

The spelling of 42164872 in words is "forty-two million, one hundred sixty-four thousand, eight hundred seventy-two".