42009029 has 2 divisors, whose sum is σ = 42009030. Its totient is φ = 42009028.

The previous prime is 42009001. The next prime is 42009047. The reversal of 42009029 is 92090024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39753025 + 2256004 = 6305^2 + 1502^2 .

It is a cyclic number.

It is not a de Polignac number, because 42009029 - 2⁸ = 42008773 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42008989 and 42009007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42009049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21004514 + 21004515.

It is an arithmetic number, because the mean of its divisors is an integer number (21004515).

Almost surely, 2^42009029 is an apocalyptic number.

It is an amenable number.

42009029 is a deficient number, since it is larger than the sum of its proper divisors (1).

42009029 is an equidigital number, since it uses as much as digits as its factorization.

42009029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 42009029 is about 6481.4372634471. The cubic root of 42009029 is about 347.6275714695.

The spelling of 42009029 in words is "forty-two million, nine thousand, twenty-nine".