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1243420 = 22562171
BaseRepresentation
bin100101111100100011100
32100011122121
410233210130
5304242140
642352324
713366063
oct4574434
92304577
101243420
1177a222
124bb6a4
13346c69
142451da
1519864a
hex12f91c

1243420 has 12 divisors (see below), whose sum is σ = 2611224. Its totient is φ = 497360.

The previous prime is 1243393. The next prime is 1243421. The reversal of 1243420 is 243421.

It is a junction number, because it is equal to n+sod(n) for n = 1243394 and 1243403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243421) 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, 31066 + ... + 31105.

It is an arithmetic number, because the mean of its divisors is an integer number (217602).

21243420 is an apocalyptic number.

1243420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243420 is an abundant number, since it is smaller than the sum of its proper divisors (1367804).

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

1243420 is a wasteful number, since it uses less digits than its factorization.

1243420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62180 (or 62178 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1243420 is about 1115.0874405176. The cubic root of 1243420 is about 107.5323861318.

Adding to 1243420 its reverse (243421), we get a palindrome (1486841).

Subtracting from 1243420 its reverse (243421), we obtain a palindrome (999999).

The spelling of 1243420 in words is "one million, two hundred forty-three thousand, four hundred twenty".

Divisors: 1 2 4 5 10 20 62171 124342 248684 310855 621710 1243420