42909623 has 2 divisors, whose sum is σ = 42909624. Its totient is φ = 42909622.

The previous prime is 42909613. The next prime is 42909641. The reversal of 42909623 is 32690924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42909623 - 2⁸ = 42909367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42909613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21454811 + 21454812.

It is an arithmetic number, because the mean of its divisors is an integer number (21454812).

Almost surely, 2^42909623 is an apocalyptic number.

42909623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42909623 is an equidigital number, since it uses as much as digits as its factorization.

42909623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 42909623 is about 6550.5437178909. The cubic root of 42909623 is about 350.0941868964.

The spelling of 42909623 in words is "forty-two million, nine hundred nine thousand, six hundred twenty-three".