1866345442 has 32 divisors (see below), whose sum is σ = 3331020672. Its totient is φ = 775467264.

The previous prime is 1866345413. The next prime is 1866345443. The reversal of 1866345442 is 2445436681.

It is not an unprimeable number, because it can be changed into a prime (1866345443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81628 + ... + 101959.

It is an arithmetic number, because the mean of its divisors is an integer number (104094396).

Almost surely, 2^1866345442 is an apocalyptic number.

1866345442 is a deficient number, since it is larger than the sum of its proper divisors (1464675230).

1866345442 is a wasteful number, since it uses less digits than its factorization.

1866345442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183642.

The product of its digits is 552960, while the sum is 43.

The square root of 1866345442 is about 43201.2203762810. The cubic root of 1866345442 is about 1231.2058683212.

The spelling of 1866345442 in words is "one billion, eight hundred sixty-six million, three hundred forty-five thousand, four hundred forty-two".