42939729 has 18 divisors (see below), whose sum is σ = 72151170. Its totient is φ = 24536736.

The previous prime is 42939707. The next prime is 42939733. The reversal of 42939729 is 92793924.

42939729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 42928704 + 11025 = 6552^2 + 105^2 .

It is not a de Polignac number, because 42939729 - 2⁸ = 42939473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42939769) 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 17 ways as a sum of consecutive naturals, for example, 48244 + ... + 49125.

Almost surely, 2^42939729 is an apocalyptic number.

42939729 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

42939729 is a deficient number, since it is larger than the sum of its proper divisors (29211441).

42939729 is a wasteful number, since it uses less digits than its factorization.

42939729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97389 (or 97379 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 42939729 is about 6552.8412921419. The cubic root of 42939729 is about 350.1760447706.

The spelling of 42939729 in words is "forty-two million, nine hundred thirty-nine thousand, seven hundred twenty-nine".