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642423 = 3214141
BaseRepresentation
bin10011100110101110111
31012122020110
42130311313
5131024143
621434103
75313645
oct2346567
91178213
10642423
113a9731
1226b933
13196542
1412a195
15ca533
hex9cd77

642423 has 4 divisors (see below), whose sum is σ = 856568. Its totient is φ = 428280.

The previous prime is 642419. The next prime is 642427. The reversal of 642423 is 324246.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (642419) and next prime (642427).

It is not a de Polignac number, because 642423 - 22 = 642419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 642423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642427) 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 in 3 ways as a sum of consecutive naturals, for example, 107068 + ... + 107073.

It is an arithmetic number, because the mean of its divisors is an integer number (214142).

2642423 is an apocalyptic number.

642423 is a deficient number, since it is larger than the sum of its proper divisors (214145).

642423 is a wasteful number, since it uses less digits than its factorization.

642423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214144.

The product of its digits is 1152, while the sum is 21.

The square root of 642423 is about 801.5129443746. The cubic root of 642423 is about 86.2860047116.

Adding to 642423 its reverse (324246), we get a palindrome (966669).

The spelling of 642423 in words is "six hundred forty-two thousand, four hundred twenty-three".

Divisors: 1 3 214141 642423