42166690 has 8 divisors (see below), whose sum is σ = 75900060. Its totient is φ = 16866672.

The previous prime is 42166679. The next prime is 42166697. The reversal of 42166690 is 9666124.

It can be written as a sum of positive squares in 2 ways, for example, as 34609689 + 7557001 = 5883^2 + 2749^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×42166690² = 3556059491112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42166697) 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, 2108325 + ... + 2108344.

Almost surely, 2^42166690 is an apocalyptic number.

42166690 is a deficient number, since it is larger than the sum of its proper divisors (33733370).

42166690 is a wasteful number, since it uses less digits than its factorization.

42166690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216676.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 42166690 is about 6493.5883762370. The cubic root of 42166690 is about 348.0619137210.

The spelling of 42166690 in words is "forty-two million, one hundred sixty-six thousand, six hundred ninety".