42931723 has 2 divisors, whose sum is σ = 42931724. Its totient is φ = 42931722.

The previous prime is 42931711. The next prime is 42931747. The reversal of 42931723 is 32713924.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42931723 is a prime.

It is not a weakly prime, because it can be changed into another prime (42931703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21465861 + 21465862.

It is an arithmetic number, because the mean of its divisors is an integer number (21465862).

Almost surely, 2^42931723 is an apocalyptic number.

42931723 is a deficient number, since it is larger than the sum of its proper divisors (1).

42931723 is an equidigital number, since it uses as much as digits as its factorization.

42931723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 42931723 is about 6552.2303836175. The cubic root of 42931723 is about 350.1542802825.

The spelling of 42931723 in words is "forty-two million, nine hundred thirty-one thousand, seven hundred twenty-three".