42009122 has 12 divisors (see below), whose sum is σ = 63802950. Its totient is φ = 20744688.

The previous prime is 42009101. The next prime is 42009127. The reversal of 42009122 is 22190024.

It can be written as a sum of positive squares in only one way, i.e., 40844881 + 1164241 = 6391^2 + 1079^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42009094 and 42009103.

It is not an unprimeable number, because it can be changed into a prime (42009127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12254 + ... + 15302.

Almost surely, 2^42009122 is an apocalyptic number.

42009122 is a deficient number, since it is larger than the sum of its proper divisors (21793828).

42009122 is an equidigital number, since it uses as much as digits as its factorization.

42009122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217 (or 3134 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 42009122 is about 6481.4444377777. Note that the first 4 decimals coincide. The cubic root of 42009122 is about 347.6278279964.

Adding to 42009122 its reverse (22190024), we get a palindrome (64199146).

The spelling of 42009122 in words is "forty-two million, nine thousand, one hundred twenty-two".