Search a number
-
+
421819 = 191492
BaseRepresentation
bin1100110111110111011
3210102121221
41212332323
5101444234
613012511
73404536
oct1467673
9712557
10421819
11268a12
12184137
13119cc8
14ada1d
1584eb4
hex66fbb

421819 has 6 divisors (see below), whose sum is σ = 447020. Its totient is φ = 396936.

The previous prime is 421807. The next prime is 421831. The reversal of 421819 is 918124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421807) and next prime (421831).

It is not a de Polignac number, because 421819 - 27 = 421691 is a prime.

It is a super-2 number, since 2×4218192 = 355862537522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421793 and 421802.

It is not an unprimeable number, because it can be changed into a prime (421019) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2757 + ... + 2905.

2421819 is an apocalyptic number.

421819 is a deficient number, since it is larger than the sum of its proper divisors (25201).

421819 is an equidigital number, since it uses as much as digits as its factorization.

With its successor (421820) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (168).

421819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 168 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 421819 is about 649.4759425876. The cubic root of 421819 is about 74.9966813346.

The spelling of 421819 in words is "four hundred twenty-one thousand, eight hundred nineteen".

Divisors: 1 19 149 2831 22201 421819