42987289 has 2 divisors, whose sum is σ = 42987290. Its totient is φ = 42987288.

The previous prime is 42987233. The next prime is 42987323. The reversal of 42987289 is 98278924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37417689 + 5569600 = 6117^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 42987289 - 2¹⁷ = 42856217 is a prime.

It is not a weakly prime, because it can be changed into another prime (42987209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21493644 + 21493645.

It is an arithmetic number, because the mean of its divisors is an integer number (21493645).

Almost surely, 2^42987289 is an apocalyptic number.

It is an amenable number.

42987289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42987289 is an equidigital number, since it uses as much as digits as its factorization.

42987289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 42987289 is about 6556.4692480023. The cubic root of 42987289 is about 350.3052819446.

The spelling of 42987289 in words is "forty-two million, nine hundred eighty-seven thousand, two hundred eighty-nine".