42909023 has 4 divisors (see below), whose sum is σ = 42928848. Its totient is φ = 42889200.

The previous prime is 42909019. The next prime is 42909043. The reversal of 42909023 is 32090924.

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 42909023 - 2² = 42909019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42909043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6203 + ... + 11148.

It is an arithmetic number, because the mean of its divisors is an integer number (10732212).

Almost surely, 2^42909023 is an apocalyptic number.

42909023 is a deficient number, since it is larger than the sum of its proper divisors (19825).

42909023 is a wasteful number, since it uses less digits than its factorization.

42909023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 42909023 is about 6550.4979200058. The cubic root of 42909023 is about 350.0925551141.

Adding to 42909023 its reverse (32090924), we get a palindrome (74999947).

The spelling of 42909023 in words is "forty-two million, nine hundred nine thousand, twenty-three".