1728741421 has 8 divisors (see below), whose sum is σ = 1886216544. Its totient is φ = 1571319120.

The previous prime is 1728741419. The next prime is 1728741449. The reversal of 1728741421 is 1241478271.

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 1728741421 - 2¹ = 1728741419 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 (1728741481) 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, 91071 + ... + 108403.

It is an arithmetic number, because the mean of its divisors is an integer number (235777068).

Almost surely, 2^1728741421 is an apocalyptic number.

1728741421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1728741421 is a deficient number, since it is larger than the sum of its proper divisors (157475123).

1728741421 is a wasteful number, since it uses less digits than its factorization.

1728741421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26411.

The product of its digits is 25088, while the sum is 37.

The square root of 1728741421 is about 41578.1363338955. The cubic root of 1728741421 is about 1200.1716006913.

The spelling of 1728741421 in words is "one billion, seven hundred twenty-eight million, seven hundred forty-one thousand, four hundred twenty-one".