42890213 has 2 divisors, whose sum is σ = 42890214. Its totient is φ = 42890212.

The previous prime is 42890209. The next prime is 42890233. The reversal of 42890213 is 31209824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30052324 + 12837889 = 5482^2 + 3583^2 .

It is a cyclic number.

It is not a de Polignac number, because 42890213 - 2² = 42890209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42890233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21445106 + 21445107.

It is an arithmetic number, because the mean of its divisors is an integer number (21445107).

Almost surely, 2^42890213 is an apocalyptic number.

It is an amenable number.

42890213 is a deficient number, since it is larger than the sum of its proper divisors (1).

42890213 is an equidigital number, since it uses as much as digits as its factorization.

42890213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 42890213 is about 6549.0619939042. The cubic root of 42890213 is about 350.0413910233.

The spelling of 42890213 in words is "forty-two million, eight hundred ninety thousand, two hundred thirteen".