42020929 has 2 divisors, whose sum is σ = 42020930. Its totient is φ = 42020928.

The previous prime is 42020899. The next prime is 42020939. The reversal of 42020929 is 92902024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37797904 + 4223025 = 6148^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 42020929 - 2⁵ = 42020897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42020897 and 42020906.

It is not a weakly prime, because it can be changed into another prime (42020939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010464 + 21010465.

It is an arithmetic number, because the mean of its divisors is an integer number (21010465).

Almost surely, 2^42020929 is an apocalyptic number.

It is an amenable number.

42020929 is a deficient number, since it is larger than the sum of its proper divisors (1).

42020929 is an equidigital number, since it uses as much as digits as its factorization.

42020929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 42020929 is about 6482.3552047076. The cubic root of 42020929 is about 347.6603928069.

The spelling of 42020929 in words is "forty-two million, twenty thousand, nine hundred twenty-nine".