42918394 has 4 divisors (see below), whose sum is σ = 64377594. Its totient is φ = 21459196.

The previous prime is 42918383. The next prime is 42918413. The reversal of 42918394 is 49381924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42081169 + 837225 = 6487^2 + 915^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10729597 + ... + 10729600.

Almost surely, 2^42918394 is an apocalyptic number.

42918394 is a deficient number, since it is larger than the sum of its proper divisors (21459200).

42918394 is a wasteful number, since it uses less digits than its factorization.

42918394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21459199.

The product of its digits is 62208, while the sum is 40.

The square root of 42918394 is about 6551.2131700930. The cubic root of 42918394 is about 350.1180390979.

The spelling of 42918394 in words is "forty-two million, nine hundred eighteen thousand, three hundred ninety-four".