1721868841 has 48 divisors (see below), whose sum is σ = 2236187520. Its totient is φ = 1296979200.

The previous prime is 1721868839. The next prime is 1721868877. The reversal of 1721868841 is 1488681271.

It is not a de Polignac number, because 1721868841 - 2¹ = 1721868839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1721868791 and 1721868800.

It is not an unprimeable number, because it can be changed into a prime (1721868821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6215995 + ... + 6216271.

It is an arithmetic number, because the mean of its divisors is an integer number (46587240).

Almost surely, 2^1721868841 is an apocalyptic number.

1721868841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1721868841 is a deficient number, since it is larger than the sum of its proper divisors (514318679).

1721868841 is a wasteful number, since it uses less digits than its factorization.

1721868841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 515 counting only the distinct ones).

The product of its digits is 172032, while the sum is 46.

The square root of 1721868841 is about 41495.4074687790. The cubic root of 1721868841 is about 1198.5790683566.

The spelling of 1721868841 in words is "one billion, seven hundred twenty-one million, eight hundred sixty-eight thousand, eight hundred forty-one".