42450391 has 2 divisors, whose sum is σ = 42450392. Its totient is φ = 42450390.

The previous prime is 42450383. The next prime is 42450451. The reversal of 42450391 is 19305424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42450391 - 2³ = 42450383 is a prime.

It is a Chen prime.

It is equal to p_2573344 and since 42450391 and 2573344 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42450301) 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, 21225195 + 21225196.

It is an arithmetic number, because the mean of its divisors is an integer number (21225196).

Almost surely, 2^42450391 is an apocalyptic number.

42450391 is a deficient number, since it is larger than the sum of its proper divisors (1).

42450391 is an equidigital number, since it uses as much as digits as its factorization.

42450391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 42450391 is about 6515.3964576225. The cubic root of 42450391 is about 348.8407661045.

The spelling of 42450391 in words is "forty-two million, four hundred fifty thousand, three hundred ninety-one".