1986461 has 2 divisors, whose sum is σ = 1986462. Its totient is φ = 1986460.

The previous prime is 1986443. The next prime is 1986497. The reversal of 1986461 is 1646891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 109561 = 1370^2 + 331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1986461 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993230 + 993231.

It is an arithmetic number, because the mean of its divisors is an integer number (993231).

2^1986461 is an apocalyptic number.

It is an amenable number.

1986461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986461 is an equidigital number, since it uses as much as digits as its factorization.

1986461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 1986461 is about 1409.4186744896. The cubic root of 1986461 is about 125.7071598553.

The spelling of 1986461 in words is "one million, nine hundred eighty-six thousand, four hundred sixty-one".