1900105 has 8 divisors (see below), whose sum is σ = 2289672. Its totient is φ = 1513728.

The previous prime is 1900079. The next prime is 1900111. The reversal of 1900105 is 5010091.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 620944 = 1131^2 + 788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1900105 - 2¹⁵ = 1867337 is a prime.

It is a super-2 number, since 2×1900105² = 7220798022050, which contains 22 as substring.

It is a Duffinian number.

1900105 is a lucky number.

It is a nialpdrome in base 12.

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 7 ways as a sum of consecutive naturals, for example, 817 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (286209).

2^1900105 is an apocalyptic number.

It is an amenable number.

1900105 is a deficient number, since it is larger than the sum of its proper divisors (389567).

1900105 is a wasteful number, since it uses less digits than its factorization.

1900105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 1900105 is about 1378.4429621860. The cubic root of 1900105 is about 123.8585144832.

Adding to 1900105 its reverse (5010091), we get a palindrome (6910196).

The spelling of 1900105 in words is "one million, nine hundred thousand, one hundred five".