42323731 has 4 divisors (see below), whose sum is σ = 43783200. Its totient is φ = 40864264.

The previous prime is 42323717. The next prime is 42323737. The reversal of 42323731 is 13732324.

42323731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42323731 - 2⁹ = 42323219 is a prime.

It is a super-2 number, since 2×42323731² = 3582596411520722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42323696 and 42323705.

It is not an unprimeable number, because it can be changed into a prime (42323737) 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 3 ways as a sum of consecutive naturals, for example, 729691 + ... + 729748.

It is an arithmetic number, because the mean of its divisors is an integer number (10945800).

Almost surely, 2^42323731 is an apocalyptic number.

42323731 is a deficient number, since it is larger than the sum of its proper divisors (1459469).

42323731 is a wasteful number, since it uses less digits than its factorization.

42323731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459468.

The product of its digits is 3024, while the sum is 25.

The square root of 42323731 is about 6505.6691431397. The cubic root of 42323731 is about 348.4934729642.

The spelling of 42323731 in words is "forty-two million, three hundred twenty-three thousand, seven hundred thirty-one".