642427 has 2 divisors, whose sum is σ = 642428. Its totient is φ = 642426.

The previous prime is 642419. The next prime is 642457. The reversal of 642427 is 724246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642427 - 2³ = 642419 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4² + 4⁴ + 2 + 2¹⁹ + 7⁶ .

It is not a weakly prime, because it can be changed into another prime (642407) 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, 321213 + 321214.

It is an arithmetic number, because the mean of its divisors is an integer number (321214).

2⁶⁴²⁴²⁷ is an apocalyptic number.

642427 is a deficient number, since it is larger than the sum of its proper divisors (1).

642427 is an equidigital number, since it uses as much as digits as its factorization.

642427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 25.

The square root of 642427 is about 801.5154396517. The cubic root of 642427 is about 86.2861837958.

The spelling of 642427 in words is "six hundred forty-two thousand, four hundred twenty-seven".