42123449 has 2 divisors, whose sum is σ = 42123450. Its totient is φ = 42123448.

The previous prime is 42123401. The next prime is 42123461. The reversal of 42123449 is 94432124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25050025 + 17073424 = 5005^2 + 4132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42123449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42123469) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061724 + 21061725.

It is an arithmetic number, because the mean of its divisors is an integer number (21061725).

Almost surely, 2^42123449 is an apocalyptic number.

It is an amenable number.

42123449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123449 is an equidigital number, since it uses as much as digits as its factorization.

42123449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 42123449 is about 6490.2580071982. The cubic root of 42123449 is about 347.9428964523.

The spelling of 42123449 in words is "forty-two million, one hundred twenty-three thousand, four hundred forty-nine".