1868771721 has 8 divisors (see below), whose sum is σ = 2493613120. Its totient is φ = 1244889072.

The previous prime is 1868771683. The next prime is 1868771731. The reversal of 1868771721 is 1271778681.

1868771721 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1868771721 - 2¹¹ = 1868769673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868771731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235126 + ... + 242943.

It is an arithmetic number, because the mean of its divisors is an integer number (311701640).

Almost surely, 2^1868771721 is an apocalyptic number.

It is an amenable number.

1868771721 is a deficient number, since it is larger than the sum of its proper divisors (624841399).

1868771721 is a wasteful number, since it uses less digits than its factorization.

1868771721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479375.

The product of its digits is 263424, while the sum is 48.

The square root of 1868771721 is about 43229.2923953192. The cubic root of 1868771721 is about 1231.7391664127.

The spelling of 1868771721 in words is "one billion, eight hundred sixty-eight million, seven hundred seventy-one thousand, seven hundred twenty-one".