42749719 has 4 divisors (see below), whose sum is σ = 42767080. Its totient is φ = 42732360.

The previous prime is 42749717. The next prime is 42749723. The reversal of 42749719 is 91794724.

42749719 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42749719 - 2¹ = 42749717 is a prime.

It is a super-2 number, since 2×42749719² = 3655076949157922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42749711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4224 + ... + 10165.

It is an arithmetic number, because the mean of its divisors is an integer number (10691770).

Almost surely, 2^42749719 is an apocalyptic number.

42749719 is a deficient number, since it is larger than the sum of its proper divisors (17361).

42749719 is a wasteful number, since it uses less digits than its factorization.

42749719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17360.

The product of its digits is 127008, while the sum is 43.

The square root of 42749719 is about 6538.3269266686. The cubic root of 42749719 is about 349.6587667417.

The spelling of 42749719 in words is "forty-two million, seven hundred forty-nine thousand, seven hundred nineteen".