42446857 has 2 divisors, whose sum is σ = 42446858. Its totient is φ = 42446856.

The previous prime is 42446851. The next prime is 42446867. The reversal of 42446857 is 75864424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37711881 + 4734976 = 6141^2 + 2176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42446857 is a prime.

It is not a weakly prime, because it can be changed into another prime (42446851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21223428 + 21223429.

It is an arithmetic number, because the mean of its divisors is an integer number (21223429).

Almost surely, 2^42446857 is an apocalyptic number.

It is an amenable number.

42446857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42446857 is an equidigital number, since it uses as much as digits as its factorization.

42446857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 40.

The square root of 42446857 is about 6515.1252482205. The cubic root of 42446857 is about 348.8310854911.

The spelling of 42446857 in words is "forty-two million, four hundred forty-six thousand, eight hundred fifty-seven".