1980105 has 16 divisors (see below), whose sum is σ = 3201984. Its totient is φ = 1044800.

The previous prime is 1980103. The next prime is 1980113. The reversal of 1980105 is 5010891.

It is not a de Polignac number, because 1980105 - 2¹ = 1980103 is a prime.

It is a super-2 number, since 2×1980105² = 7841631622050, which contains 22 as substring.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1980101) 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, 862 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (200124).

2^1980105 is an apocalyptic number.

1980105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1980105 is a deficient number, since it is larger than the sum of its proper divisors (1221879).

1980105 is a wasteful number, since it uses less digits than its factorization.

1980105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1980105 is about 1407.1620375778. The cubic root of 1980105 is about 125.5729432097.

Adding to 1980105 its reverse (5010891), we get a palindrome (6990996).

The spelling of 1980105 in words is "one million, nine hundred eighty thousand, one hundred five".