1986025 has 12 divisors (see below), whose sum is σ = 2608092. Its totient is φ = 1495040.

The previous prime is 1986001. The next prime is 1986029. The reversal of 1986025 is 5206891.

1986025 = 996² + 997².

It can be written as a sum of positive squares in 6 ways, for example, as 168921 + 1817104 = 411^2 + 1348^2 .

It is not a de Polignac number, because 1986025 - 2⁷ = 1985897 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986029) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1912 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (217341).

2^1986025 is an apocalyptic number.

1986025 is the 997-th centered square number.

It is an amenable number.

1986025 is a deficient number, since it is larger than the sum of its proper divisors (622067).

1986025 is a wasteful number, since it uses less digits than its factorization.

1986025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700 (or 4695 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1986025 is about 1409.2639923024. The cubic root of 1986025 is about 125.6979622032.

The spelling of 1986025 in words is "one million, nine hundred eighty-six thousand, twenty-five".