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421643 is a prime number
BaseRepresentation
bin1100110111100001011
3210102101102
41212330023
5101443033
613012015
73404165
oct1467413
9712342
10421643
11268872
1218400b
13119bc1
14ad935
1584de8
hex66f0b

421643 has 2 divisors, whose sum is σ = 421644. Its totient is φ = 421642.

The previous prime is 421639. The next prime is 421657. The reversal of 421643 is 346124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421643 - 22 = 421639 is a prime.

It is not a weakly prime, because it can be changed into another prime (421633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210821 + 210822.

It is an arithmetic number, because the mean of its divisors is an integer number (210822).

2421643 is an apocalyptic number.

421643 is a deficient number, since it is larger than the sum of its proper divisors (1).

421643 is an equidigital number, since it uses as much as digits as its factorization.

421643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 421643 is about 649.3404345950. The cubic root of 421643 is about 74.9862493309.

Adding to 421643 its reverse (346124), we get a palindrome (767767).

It can be divided in two parts, 42 and 1643, that multiplied together give a triangular number (69006 = T371).

The spelling of 421643 in words is "four hundred twenty-one thousand, six hundred forty-three".