42809924 has 6 divisors (see below), whose sum is σ = 74917374. Its totient is φ = 21404960.

The previous prime is 42809911. The next prime is 42809929. The reversal of 42809924 is 42990824.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 17909824 = 4990^2 + 4232^2 .

It is not an unprimeable number, because it can be changed into a prime (42809929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5351237 + ... + 5351244.

It is an arithmetic number, because the mean of its divisors is an integer number (12486229).

Almost surely, 2^42809924 is an apocalyptic number.

It is an amenable number.

42809924 is a deficient number, since it is larger than the sum of its proper divisors (32107450).

42809924 is a wasteful number, since it uses less digits than its factorization.

42809924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702485 (or 10702483 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 42809924 is about 6542.9293133886. The cubic root of 42809924 is about 349.8228327835.

The spelling of 42809924 in words is "forty-two million, eight hundred nine thousand, nine hundred twenty-four".