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421240 = 23510531
BaseRepresentation
bin1100110110101111000
3210101211111
41212311320
5101434430
613010104
73403051
oct1466570
9711744
10421240
11268536
12183934
13119971
14ad728
1584c2a
hex66d78

421240 has 16 divisors (see below), whose sum is σ = 947880. Its totient is φ = 168480.

The previous prime is 421207. The next prime is 421241. The reversal of 421240 is 42124.

Adding to 421240 its reverse (42124), we get a palindrome (463364).

It is a self number, because there is not a number n which added to its sum of digits gives 421240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421241) 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 in 3 ways as a sum of consecutive naturals, for example, 5226 + ... + 5305.

2421240 is an apocalyptic number.

421240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421240 is an abundant number, since it is smaller than the sum of its proper divisors (526640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421240 is a wasteful number, since it uses less digits than its factorization.

421240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10542 (or 10538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 421240 is about 649.0300455295. The cubic root of 421240 is about 74.9623514747.

The spelling of 421240 in words is "four hundred twenty-one thousand, two hundred forty", and thus it is an iban number.

Divisors: 1 2 4 5 8 10 20 40 10531 21062 42124 52655 84248 105310 210620 421240