Search a number
-
+
1228143 = 37233251
BaseRepresentation
bin100101011110101101111
32022101200210
410223311233
5303300033
642153503
713303410
oct4536557
92271623
101228143
117697a4
124b2893
13340017
1423d807
15193d63
hex12bd6f

1228143 has 16 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 696000.

The previous prime is 1228133. The next prime is 1228147. The reversal of 1228143 is 3418221.

It is not a de Polignac number, because 1228143 - 28 = 1227887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4768 + ... + 5018.

It is an arithmetic number, because the mean of its divisors is an integer number (117936).

21228143 is an apocalyptic number.

1228143 is a deficient number, since it is larger than the sum of its proper divisors (658833).

1228143 is a wasteful number, since it uses less digits than its factorization.

1228143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494.

The product of its digits is 384, while the sum is 21.

The square root of 1228143 is about 1108.2161341543. The cubic root of 1228143 is about 107.0901793110.

The spelling of 1228143 in words is "one million, two hundred twenty-eight thousand, one hundred forty-three".

Divisors: 1 3 7 21 233 251 699 753 1631 1757 4893 5271 58483 175449 409381 1228143