42402589 has 2 divisors, whose sum is σ = 42402590. Its totient is φ = 42402588.

The previous prime is 42402587. The next prime is 42402617. The reversal of 42402589 is 98520424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25674489 + 16728100 = 5067^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 42402589 - 2¹ = 42402587 is a prime.

Together with 42402587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42402583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201294 + 21201295.

It is an arithmetic number, because the mean of its divisors is an integer number (21201295).

Almost surely, 2^42402589 is an apocalyptic number.

It is an amenable number.

42402589 is a deficient number, since it is larger than the sum of its proper divisors (1).

42402589 is an equidigital number, since it uses as much as digits as its factorization.

42402589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 42402589 is about 6511.7270366624. The cubic root of 42402589 is about 348.7097775240.

It can be divided in two parts, 42402 and 589, that multiplied together give a triangular number (24974778 = T₇₀₆₇).

The spelling of 42402589 in words is "forty-two million, four hundred two thousand, five hundred eighty-nine".