42446813 has 2 divisors, whose sum is σ = 42446814. Its totient is φ = 42446812.

The previous prime is 42446809. The next prime is 42446819. The reversal of 42446813 is 31864424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23454649 + 18992164 = 4843^2 + 4358^2 .

It is a cyclic number.

It is not a de Polignac number, because 42446813 - 2² = 42446809 is a prime.

It is a super-3 number, since 3×42446813³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42446813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42446819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21223406 + 21223407.

It is an arithmetic number, because the mean of its divisors is an integer number (21223407).

Almost surely, 2^42446813 is an apocalyptic number.

It is an amenable number.

42446813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42446813 is an equidigital number, since it uses as much as digits as its factorization.

42446813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 32.

The square root of 42446813 is about 6515.1218714618. The cubic root of 42446813 is about 348.8309649594.

The spelling of 42446813 in words is "forty-two million, four hundred forty-six thousand, eight hundred thirteen".