1721974013860 has 12 divisors (see below), whose sum is σ = 3616145429148. Its totient is φ = 688789605536.

The previous prime is 1721974013839. The next prime is 1721974013861. The reversal of 1721974013860 is 683104791271.

It can be written as a sum of positive squares in 2 ways, for example, as 1141183700644 + 580790313216 = 1068262^2 + 762096^2 .

It is not an unprimeable number, because it can be changed into a prime (1721974013861) 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, 43049350327 + ... + 43049350366.

It is an arithmetic number, because the mean of its divisors is an integer number (301345452429).

Almost surely, 2^{1721974013860} is an apocalyptic number.

1721974013860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721974013860 is an abundant number, since it is smaller than the sum of its proper divisors (1894171415288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721974013860 is a wasteful number, since it uses less digits than its factorization.

1721974013860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86098700702 (or 86098700700 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 1721974013860 in words is "one trillion, seven hundred twenty-one billion, nine hundred seventy-four million, thirteen thousand, eight hundred sixty".