42090973 has 2 divisors, whose sum is σ = 42090974. Its totient is φ = 42090972.

The previous prime is 42090949. The next prime is 42091003. The reversal of 42090973 is 37909024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39275289 + 2815684 = 6267^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 42090973 - 2¹⁷ = 41959901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42090773) 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, 21045486 + 21045487.

It is an arithmetic number, because the mean of its divisors is an integer number (21045487).

Almost surely, 2^42090973 is an apocalyptic number.

It is an amenable number.

42090973 is a deficient number, since it is larger than the sum of its proper divisors (1).

42090973 is an equidigital number, since it uses as much as digits as its factorization.

42090973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 42090973 is about 6487.7556211682. The cubic root of 42090973 is about 347.8534553852.

Adding to 42090973 its reverse (37909024), we get a palindrome (79999997).

The spelling of 42090973 in words is "forty-two million, ninety thousand, nine hundred seventy-three".