42442157 has 2 divisors, whose sum is σ = 42442158. Its totient is φ = 42442156.

The previous prime is 42442129. The next prime is 42442159. The reversal of 42442157 is 75124424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42367081 + 75076 = 6509^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 42442157 - 2⁸ = 42441901 is a prime.

Together with 42442159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42442159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221078 + 21221079.

It is an arithmetic number, because the mean of its divisors is an integer number (21221079).

Almost surely, 2^42442157 is an apocalyptic number.

It is an amenable number.

42442157 is a deficient number, since it is larger than the sum of its proper divisors (1).

42442157 is an equidigital number, since it uses as much as digits as its factorization.

42442157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 29.

The square root of 42442157 is about 6514.7645391065. The cubic root of 42442157 is about 348.8182100453.

The spelling of 42442157 in words is "forty-two million, four hundred forty-two thousand, one hundred fifty-seven".