42029989 has 2 divisors, whose sum is σ = 42029990. Its totient is φ = 42029988.

The previous prime is 42029987. The next prime is 42030031. The reversal of 42029989 is 98992024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40220964 + 1809025 = 6342^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 42029989 - 2¹ = 42029987 is a prime.

Together with 42029987, 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 (42029987) 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, 21014994 + 21014995.

It is an arithmetic number, because the mean of its divisors is an integer number (21014995).

Almost surely, 2^42029989 is an apocalyptic number.

It is an amenable number.

42029989 is a deficient number, since it is larger than the sum of its proper divisors (1).

42029989 is an equidigital number, since it uses as much as digits as its factorization.

42029989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 42029989 is about 6483.0539871267. The cubic root of 42029989 is about 347.6853769984.

The spelling of 42029989 in words is "forty-two million, twenty-nine thousand, nine hundred eighty-nine".