42742489 has 2 divisors, whose sum is σ = 42742490. Its totient is φ = 42742488.

The previous prime is 42742477. The next prime is 42742507. The reversal of 42742489 is 98424724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32114889 + 10627600 = 5667^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 42742489 - 2¹¹ = 42740441 is a prime.

It is not a weakly prime, because it can be changed into another prime (42742409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21371244 + 21371245.

It is an arithmetic number, because the mean of its divisors is an integer number (21371245).

Almost surely, 2^42742489 is an apocalyptic number.

It is an amenable number.

42742489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42742489 is an equidigital number, since it uses as much as digits as its factorization.

42742489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The square root of 42742489 is about 6537.7740095540. The cubic root of 42742489 is about 349.6390537434.

The spelling of 42742489 in words is "forty-two million, seven hundred forty-two thousand, four hundred eighty-nine".