42729818 has 8 divisors (see below), whose sum is σ = 66304980. Its totient is φ = 20628160.

The previous prime is 42729793. The next prime is 42729899. The reversal of 42729818 is 81892724.

It can be written as a sum of positive squares in 2 ways, for example, as 42680089 + 49729 = 6533^2 + 223^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368303 + ... + 368418.

Almost surely, 2^42729818 is an apocalyptic number.

42729818 is a deficient number, since it is larger than the sum of its proper divisors (23575162).

42729818 is a wasteful number, since it uses less digits than its factorization.

42729818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736752.

The product of its digits is 64512, while the sum is 41.

The square root of 42729818 is about 6536.8048770022. The cubic root of 42729818 is about 349.6045001925.

The spelling of 42729818 in words is "forty-two million, seven hundred twenty-nine thousand, eight hundred eighteen".