42920909 has 2 divisors, whose sum is σ = 42920910. Its totient is φ = 42920908.

The previous prime is 42920897. The next prime is 42920929. The reversal of 42920909 is 90902924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23251684 + 19669225 = 4822^2 + 4435^2 .

It is a cyclic number.

It is not a de Polignac number, because 42920909 - 2⁸ = 42920653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42920929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21460454 + 21460455.

It is an arithmetic number, because the mean of its divisors is an integer number (21460455).

Almost surely, 2^42920909 is an apocalyptic number.

It is an amenable number.

42920909 is a deficient number, since it is larger than the sum of its proper divisors (1).

42920909 is an equidigital number, since it uses as much as digits as its factorization.

42920909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 42920909 is about 6551.4051164617. The cubic root of 42920909 is about 350.1248778880.

The spelling of 42920909 in words is "forty-two million, nine hundred twenty thousand, nine hundred nine".