1866049 has 2 divisors, whose sum is σ = 1866050. Its totient is φ = 1866048.

The previous prime is 1866043. The next prime is 1866083. The reversal of 1866049 is 9406681.

It is an a-pointer prime, because the next prime (1866083) can be obtained adding 1866049 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065024 + 801025 = 1032^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866049 - 2⁹ = 1865537 is a prime.

1866049 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933024 + 933025.

It is an arithmetic number, because the mean of its divisors is an integer number (933025).

2^1866049 is an apocalyptic number.

It is an amenable number.

1866049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866049 is an equidigital number, since it uses as much as digits as its factorization.

1866049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1866049 is about 1366.0340405715. The cubic root of 1866049 is about 123.1140678450.

The spelling of 1866049 in words is "one million, eight hundred sixty-six thousand, forty-nine".