42189289 has 2 divisors, whose sum is σ = 42189290. Its totient is φ = 42189288.

The previous prime is 42189271. The next prime is 42189313. The reversal of 42189289 is 98298124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42029289 + 160000 = 6483^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 42189289 - 2²³ = 33800681 is a prime.

It is a super-2 number, since 2×42189289² = 3559872212651042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42189209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21094644 + 21094645.

It is an arithmetic number, because the mean of its divisors is an integer number (21094645).

Almost surely, 2^42189289 is an apocalyptic number.

It is an amenable number.

42189289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42189289 is an equidigital number, since it uses as much as digits as its factorization.

42189289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 42189289 is about 6495.3282442075. The cubic root of 42189289 is about 348.1240832232.

The spelling of 42189289 in words is "forty-two million, one hundred eighty-nine thousand, two hundred eighty-nine".