42089818 has 8 divisors (see below), whose sum is σ = 63558900. Its totient is φ = 20903520.

The previous prime is 42089813. The next prime is 42089837. The reversal of 42089818 is 81898024.

It can be written as a sum of positive squares in 2 ways, for example, as 42081169 + 8649 = 6487^2 + 93^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42089813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70323 + ... + 70918.

Almost surely, 2^42089818 is an apocalyptic number.

42089818 is a deficient number, since it is larger than the sum of its proper divisors (21469082).

42089818 is a wasteful number, since it uses less digits than its factorization.

42089818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141392.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 42089818 is about 6487.6666067239. Note that the first 4 decimals coincide. The cubic root of 42089818 is about 347.8502735912.

The spelling of 42089818 in words is "forty-two million, eighty-nine thousand, eight hundred eighteen".