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1220055 = 35163499
BaseRepresentation
bin100101001110111010111
32021222121020
410221313113
5303020210
642052223
713241004
oct4516727
92258536
101220055
11763711
124aa073
13339435
1423a8ab
15191770
hex129dd7

1220055 has 16 divisors (see below), whose sum is σ = 1968000. Its totient is φ = 645408.

The previous prime is 1220041. The next prime is 1220071. The reversal of 1220055 is 5500221.

1220055 = T210 + T211 + ... + T254.

It is not a de Polignac number, because 1220055 - 26 = 1219991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2196 + ... + 2694.

It is an arithmetic number, because the mean of its divisors is an integer number (123000).

21220055 is an apocalyptic number.

1220055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220055 is a deficient number, since it is larger than the sum of its proper divisors (747945).

1220055 is a wasteful number, since it uses less digits than its factorization.

1220055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1220055 is about 1104.5609987683. The cubic root of 1220055 is about 106.8545787048.

Adding to 1220055 its reverse (5500221), we get a palindrome (6720276).

The spelling of 1220055 in words is "one million, two hundred twenty thousand, fifty-five".

Divisors: 1 3 5 15 163 489 499 815 1497 2445 2495 7485 81337 244011 406685 1220055