1986541 has 2 divisors, whose sum is σ = 1986542. Its totient is φ = 1986540.

The previous prime is 1986539. The next prime is 1986547. The reversal of 1986541 is 1456891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1510441 + 476100 = 1229^2 + 690^2 .

It is an emirp because it is prime and its reverse (1456891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1986541 - 2¹ = 1986539 is a prime.

Together with 1986539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1986497 and 1986506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993270 + 993271.

It is an arithmetic number, because the mean of its divisors is an integer number (993271).

2^1986541 is an apocalyptic number.

It is an amenable number.

1986541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986541 is an equidigital number, since it uses as much as digits as its factorization.

1986541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 1986541 is about 1409.4470546991. The cubic root of 1986541 is about 125.7088473518.

The spelling of 1986541 in words is "one million, nine hundred eighty-six thousand, five hundred forty-one".