42281816 has 8 divisors (see below), whose sum is σ = 79278420. Its totient is φ = 21140904.

The previous prime is 42281807. The next prime is 42281831. The reversal of 42281816 is 61818224.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2642606 + ... + 2642621.

Almost surely, 2^42281816 is an apocalyptic number.

It is an amenable number.

42281816 is a deficient number, since it is larger than the sum of its proper divisors (36996604).

42281816 is a wasteful number, since it uses less digits than its factorization.

42281816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5285233 (or 5285229 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 42281816 is about 6502.4469240433. The cubic root of 42281816 is about 348.3783923051.

The spelling of 42281816 in words is "forty-two million, two hundred eighty-one thousand, eight hundred sixteen".