42749729 has 4 divisors (see below), whose sum is σ = 46636080. Its totient is φ = 38863380.

The previous prime is 42749723. The next prime is 42749737. The reversal of 42749729 is 92794724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42749729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42749729.

It is not an unprimeable number, because it can be changed into a prime (42749723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943159 + ... + 1943180.

It is an arithmetic number, because the mean of its divisors is an integer number (11659020).

Almost surely, 2^42749729 is an apocalyptic number.

It is an amenable number.

42749729 is a deficient number, since it is larger than the sum of its proper divisors (3886351).

42749729 is a wasteful number, since it uses less digits than its factorization.

42749729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886350.

The product of its digits is 254016, while the sum is 44.

The square root of 42749729 is about 6538.3276913902. The cubic root of 42749729 is about 349.6587940058.

The spelling of 42749729 in words is "forty-two million, seven hundred forty-nine thousand, seven hundred twenty-nine".