42404189 has 2 divisors, whose sum is σ = 42404190. Its totient is φ = 42404188.

The previous prime is 42404147. The next prime is 42404227. The reversal of 42404189 is 98140424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42120100 + 284089 = 6490^2 + 533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42404189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42404489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202094 + 21202095.

It is an arithmetic number, because the mean of its divisors is an integer number (21202095).

Almost surely, 2^42404189 is an apocalyptic number.

It is an amenable number.

42404189 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404189 is an equidigital number, since it uses as much as digits as its factorization.

42404189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 42404189 is about 6511.8498907760. The cubic root of 42404189 is about 348.7141634875.

The spelling of 42404189 in words is "forty-two million, four hundred four thousand, one hundred eighty-nine".