42089639 has 2 divisors, whose sum is σ = 42089640. Its totient is φ = 42089638.

The previous prime is 42089591. The next prime is 42089651. The reversal of 42089639 is 93698024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42089639 - 2¹² = 42085543 is a prime.

It is a super-2 number, since 2×42089639² = 3543075422300642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 42089596 and 42089605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42088639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21044819 + 21044820.

It is an arithmetic number, because the mean of its divisors is an integer number (21044820).

Almost surely, 2^42089639 is an apocalyptic number.

42089639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42089639 is an equidigital number, since it uses as much as digits as its factorization.

42089639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 42089639 is about 6487.6528113024. The cubic root of 42089639 is about 347.8497804768.

The spelling of 42089639 in words is "forty-two million, eighty-nine thousand, six hundred thirty-nine".