42409229 has 2 divisors, whose sum is σ = 42409230. Its totient is φ = 42409228.

The previous prime is 42409219. The next prime is 42409243. The reversal of 42409229 is 92290424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42276004 + 133225 = 6502^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 42409229 - 2⁸ = 42408973 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42409195 and 42409204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42409219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21204614 + 21204615.

It is an arithmetic number, because the mean of its divisors is an integer number (21204615).

Almost surely, 2^42409229 is an apocalyptic number.

It is an amenable number.

42409229 is a deficient number, since it is larger than the sum of its proper divisors (1).

42409229 is an equidigital number, since it uses as much as digits as its factorization.

42409229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 42409229 is about 6512.2368660853. The cubic root of 42409229 is about 348.7279785515.

The spelling of 42409229 in words is "forty-two million, four hundred nine thousand, two hundred twenty-nine".