1868681447 has 4 divisors (see below), whose sum is σ = 1895000976. Its totient is φ = 1842361920.

The previous prime is 1868681443. The next prime is 1868681459. The reversal of 1868681447 is 7441868681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1868681447 - 2² = 1868681443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868681443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13159658 + ... + 13159799.

It is an arithmetic number, because the mean of its divisors is an integer number (473750244).

Almost surely, 2^1868681447 is an apocalyptic number.

1868681447 is a deficient number, since it is larger than the sum of its proper divisors (26319529).

1868681447 is an equidigital number, since it uses as much as digits as its factorization.

1868681447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26319528.

The product of its digits is 2064384, while the sum is 53.

The square root of 1868681447 is about 43228.2482527340. The cubic root of 1868681447 is about 1231.7193323847.

The spelling of 1868681447 in words is "one billion, eight hundred sixty-eight million, six hundred eighty-one thousand, four hundred forty-seven".