42006889 has 2 divisors, whose sum is σ = 42006890. Its totient is φ = 42006888.

The previous prime is 42006859. The next prime is 42006911. The reversal of 42006889 is 98860024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36808489 + 5198400 = 6067^2 + 2280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42006889 is a prime.

It is not a weakly prime, because it can be changed into another prime (42006859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21003444 + 21003445.

It is an arithmetic number, because the mean of its divisors is an integer number (21003445).

Almost surely, 2^42006889 is an apocalyptic number.

It is an amenable number.

42006889 is a deficient number, since it is larger than the sum of its proper divisors (1).

42006889 is an equidigital number, since it uses as much as digits as its factorization.

42006889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 42006889 is about 6481.2721745040. The cubic root of 42006889 is about 347.6216684874.

The spelling of 42006889 in words is "forty-two million, six thousand, eight hundred eighty-nine".