1866240007 has 2 divisors, whose sum is σ = 1866240008. Its totient is φ = 1866240006.

The previous prime is 1866239971. The next prime is 1866240011. The reversal of 1866240007 is 7000426681.

It is a strong prime.

It is an emirp because it is prime and its reverse (7000426681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866240007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866240067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933120003 + 933120004.

It is an arithmetic number, because the mean of its divisors is an integer number (933120004).

Almost surely, 2^1866240007 is an apocalyptic number.

1866240007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866240007 is an equidigital number, since it uses as much as digits as its factorization.

1866240007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1866240007 is about 43200.0000810185. Note that the first 4 decimals coincide. The cubic root of 1866240007 is about 1231.1826831466.

Adding to 1866240007 its reverse (7000426681), we get a palindrome (8866666688).

The spelling of 1866240007 in words is "one billion, eight hundred sixty-six million, two hundred forty thousand, seven".