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421813 = 760259
BaseRepresentation
bin1100110111110110101
3210102121201
41212332311
5101444223
613012501
73404530
oct1467665
9712551
10421813
11268a07
12184131
13119cc2
14ada17
1584ead
hex66fb5

421813 has 4 divisors (see below), whose sum is σ = 482080. Its totient is φ = 361548.

The previous prime is 421807. The next prime is 421831. The reversal of 421813 is 318124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-421813 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421313) 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, 30123 + ... + 30136.

It is an arithmetic number, because the mean of its divisors is an integer number (120520).

2421813 is an apocalyptic number.

It is an amenable number.

421813 is a deficient number, since it is larger than the sum of its proper divisors (60267).

421813 is an equidigital number, since it uses as much as digits as its factorization.

421813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60266.

The product of its digits is 192, while the sum is 19.

The square root of 421813 is about 649.4713234624. The cubic root of 421813 is about 74.9963257459.

Adding to 421813 its reverse (318124), we get a palindrome (739937).

The spelling of 421813 in words is "four hundred twenty-one thousand, eight hundred thirteen".

Divisors: 1 7 60259 421813