42138279349 has 4 divisors (see below), whose sum is σ = 42209339436. Its totient is φ = 42067219264.

The previous prime is 42138279289. The next prime is 42138279353. The reversal of 42138279349 is 94397283124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27142562500 + 14995716849 = 164750^2 + 122457^2 .

It is a cyclic number.

It is not a de Polignac number, because 42138279349 - 2²¹ = 42136182197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42138279296 and 42138279305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42138279749) 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, 35529154 + ... + 35530339.

It is an arithmetic number, because the mean of its divisors is an integer number (10552334859).

Almost surely, 2^42138279349 is an apocalyptic number.

It is an amenable number.

42138279349 is a deficient number, since it is larger than the sum of its proper divisors (71060087).

42138279349 is an equidigital number, since it uses as much as digits as its factorization.

42138279349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71060086.

The product of its digits is 2612736, while the sum is 52.

The spelling of 42138279349 in words is "forty-two billion, one hundred thirty-eight million, two hundred seventy-nine thousand, three hundred forty-nine".