1866212007 has 16 divisors (see below), whose sum is σ = 2715560832. Its totient is φ = 1130591520.

The previous prime is 1866211993. The next prime is 1866212011. The reversal of 1866212007 is 7002126681.

It is not a de Polignac number, because 1866212007 - 2¹⁴ = 1866195623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866212017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86568 + ... + 105954.

It is an arithmetic number, because the mean of its divisors is an integer number (169722552).

Almost surely, 2^1866212007 is an apocalyptic number.

1866212007 is a deficient number, since it is larger than the sum of its proper divisors (849348825).

1866212007 is a wasteful number, since it uses less digits than its factorization.

1866212007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22318.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1866212007 is about 43199.6760057295. The cubic root of 1866212007 is about 1231.1765257950.

Adding to 1866212007 its reverse (7002126681), we get a palindrome (8868338688).

The spelling of 1866212007 in words is "one billion, eight hundred sixty-six million, two hundred twelve thousand, seven".