1200105 has 12 divisors (see below), whose sum is σ = 2080260. Its totient is φ = 640032.

The previous prime is 1200083. The next prime is 1200109. The reversal of 1200105 is 5010021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 898704 + 301401 = 948^2 + 549^2 .

It is not a de Polignac number, because 1200105 - 2⁹ = 1199593 is a prime.

It is a super-2 number, since 2×1200105² = 2880504022050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1200109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13290 + ... + 13379.

It is an arithmetic number, because the mean of its divisors is an integer number (173355).

2^1200105 is an apocalyptic number.

1200105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200105 is a deficient number, since it is larger than the sum of its proper divisors (880155).

1200105 is a wasteful number, since it uses less digits than its factorization.

1200105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26680 (or 26677 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1200105 is about 1095.4930396858. The cubic root of 1200105 is about 106.2689562487.

Adding to 1200105 its reverse (5010021), we get a palindrome (6210126).

The spelling of 1200105 in words is "one million, two hundred thousand, one hundred five".