42731723 has 8 divisors (see below), whose sum is σ = 45627648. Its totient is φ = 39922344.

The previous prime is 42731687. The next prime is 42731743. The reversal of 42731723 is 32713724.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42731723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42731743) 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, 20615 + ... + 22592.

It is an arithmetic number, because the mean of its divisors is an integer number (5703456).

Almost surely, 2^42731723 is an apocalyptic number.

42731723 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

42731723 is a deficient number, since it is larger than the sum of its proper divisors (2895925).

42731723 is a wasteful number, since it uses less digits than its factorization.

42731723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43273.

The product of its digits is 7056, while the sum is 29.

The square root of 42731723 is about 6536.9505887684. The cubic root of 42731723 is about 349.6096955238.

It can be divided in two parts, 4273172 and 3, that multiplied together give a triangular number (12819516 = T₅₀₆₃).

The spelling of 42731723 in words is "forty-two million, seven hundred thirty-one thousand, seven hundred twenty-three".