42090733 has 2 divisors, whose sum is σ = 42090734. Its totient is φ = 42090732.

The previous prime is 42090731. The next prime is 42090739. The reversal of 42090733 is 33709024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21178404 + 20912329 = 4602^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 42090733 - 2¹ = 42090731 is a prime.

Together with 42090731, 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 (42090731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045366 + 21045367.

It is an arithmetic number, because the mean of its divisors is an integer number (21045367).

Almost surely, 2^42090733 is an apocalyptic number.

It is an amenable number.

42090733 is a deficient number, since it is larger than the sum of its proper divisors (1).

42090733 is an equidigital number, since it uses as much as digits as its factorization.

42090733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 42090733 is about 6487.7371247608. The cubic root of 42090733 is about 347.8527942380.

Adding to 42090733 its reverse (33709024), we get a palindrome (75799757).

The spelling of 42090733 in words is "forty-two million, ninety thousand, seven hundred thirty-three".