42006394 has 8 divisors (see below), whose sum is σ = 63567540. Its totient is φ = 20817216.

The previous prime is 42006389. The next prime is 42006403. The reversal of 42006394 is 49360024.

It can be written as a sum of positive squares in 2 ways, for example, as 35940025 + 6066369 = 5995^2 + 2463^2 .

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

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, 92709 + ... + 93160.

Almost surely, 2^42006394 is an apocalyptic number.

42006394 is a deficient number, since it is larger than the sum of its proper divisors (21561146).

42006394 is a wasteful number, since it uses less digits than its factorization.

42006394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185984.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 42006394 is about 6481.2339874441. The cubic root of 42006394 is about 347.6203030494.

The spelling of 42006394 in words is "forty-two million, six thousand, three hundred ninety-four".