42239843194 has 4 divisors (see below), whose sum is σ = 63359764794. Its totient is φ = 21119921596.

The previous prime is 42239843021. The next prime is 42239843263. The reversal of 42239843194 is 49134893224.

It is a happy number.

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., 41969668225 + 270174969 = 204865^2 + 16437^2 .

It is a Smith number, since the sum of its digits (49) 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, 10559960797 + ... + 10559960800.

Almost surely, 2^42239843194 is an apocalyptic number.

42239843194 is a deficient number, since it is larger than the sum of its proper divisors (21119921600).

42239843194 is a wasteful number, since it uses less digits than its factorization.

42239843194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21119921599.

The product of its digits is 1492992, while the sum is 49.

The spelling of 42239843194 in words is "forty-two billion, two hundred thirty-nine million, eight hundred forty-three thousand, one hundred ninety-four".