42912923 has 4 divisors (see below), whose sum is σ = 43152840. Its totient is φ = 42673008.

The previous prime is 42912911. The next prime is 42912929. The reversal of 42912923 is 32921924.

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 42912923 - 2⁴ = 42912907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42912923.

It is not an unprimeable number, because it can be changed into a prime (42912929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119690 + ... + 120047.

It is an arithmetic number, because the mean of its divisors is an integer number (10788210).

Almost surely, 2^42912923 is an apocalyptic number.

42912923 is a deficient number, since it is larger than the sum of its proper divisors (239917).

42912923 is a wasteful number, since it uses less digits than its factorization.

42912923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239916.

The product of its digits is 7776, while the sum is 32.

The square root of 42912923 is about 6550.7956005359. The cubic root of 42912923 is about 350.1031614272.

Subtracting from 42912923 its reverse (32921924), we obtain a palindrome (9990999).

The spelling of 42912923 in words is "forty-two million, nine hundred twelve thousand, nine hundred twenty-three".