42709731 has 8 divisors (see below), whose sum is σ = 57141840. Its totient is φ = 28375392.

The previous prime is 42709717. The next prime is 42709747. The reversal of 42709731 is 13790724.

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

It is not a de Polignac number, because 42709731 - 2¹¹ = 42707683 is a prime.

It is a super-2 number, since 2×42709731² = 3648242244184722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42709692 and 42709701.

It is not an unprimeable number, because it can be changed into a prime (42709631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23416 + ... + 25173.

It is an arithmetic number, because the mean of its divisors is an integer number (7142730).

Almost surely, 2^42709731 is an apocalyptic number.

42709731 is a deficient number, since it is larger than the sum of its proper divisors (14432109).

42709731 is a wasteful number, since it uses less digits than its factorization.

42709731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48885.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 42709731 is about 6535.2682423907. The cubic root of 42709731 is about 349.5497093648.

The spelling of 42709731 in words is "forty-two million, seven hundred nine thousand, seven hundred thirty-one".