42739431 has 8 divisors (see below), whose sum is σ = 65126784. Its totient is φ = 24422520.

The previous prime is 42739427. The next prime is 42739453. The reversal of 42739431 is 13493724.

42739431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42739431 - 2² = 42739427 is a prime.

It is a super-2 number, since 2×42739431² = 3653317924407522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42739392 and 42739401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42739471) 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 7 ways as a sum of consecutive naturals, for example, 1017585 + ... + 1017626.

It is an arithmetic number, because the mean of its divisors is an integer number (8140848).

Almost surely, 2^42739431 is an apocalyptic number.

42739431 is a deficient number, since it is larger than the sum of its proper divisors (22387353).

42739431 is a wasteful number, since it uses less digits than its factorization.

42739431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035221.

The product of its digits is 18144, while the sum is 33.

The square root of 42739431 is about 6537.5401337200. The cubic root of 42739431 is about 349.6307152669.

The spelling of 42739431 in words is "forty-two million, seven hundred thirty-nine thousand, four hundred thirty-one".