1868365721 has 8 divisors (see below), whose sum is σ = 1900154880. Its totient is φ = 1836780192.

The previous prime is 1868365673. The next prime is 1868365729. The reversal of 1868365721 is 1275638681.

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

It is a cyclic number.

It is not a de Polignac number, because 1868365721 - 2¹⁰ = 1868364697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1868365729) 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, 32345 + ... + 69158.

It is an arithmetic number, because the mean of its divisors is an integer number (237519360).

Almost surely, 2^1868365721 is an apocalyptic number.

It is an amenable number.

1868365721 is a deficient number, since it is larger than the sum of its proper divisors (31789159).

1868365721 is a wasteful number, since it uses less digits than its factorization.

1868365721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101815.

The product of its digits is 483840, while the sum is 47.

The square root of 1868365721 is about 43224.5962502832. The cubic root of 1868365721 is about 1231.6499594547.

The spelling of 1868365721 in words is "one billion, eight hundred sixty-eight million, three hundred sixty-five thousand, seven hundred twenty-one".