42550399 has 2 divisors, whose sum is σ = 42550400. Its totient is φ = 42550398.

The previous prime is 42550393. The next prime is 42550421. The reversal of 42550399 is 99305524.

42550399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42550399 - 2⁷ = 42550271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42550393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21275199 + 21275200.

It is an arithmetic number, because the mean of its divisors is an integer number (21275200).

Almost surely, 2^42550399 is an apocalyptic number.

42550399 is a deficient number, since it is larger than the sum of its proper divisors (1).

42550399 is an equidigital number, since it uses as much as digits as its factorization.

42550399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 42550399 is about 6523.0666867663. The cubic root of 42550399 is about 349.1144935143.

The spelling of 42550399 in words is "forty-two million, five hundred fifty thousand, three hundred ninety-nine".