1728420 has 24 divisors (see below), whose sum is σ = 4839744. Its totient is φ = 460896.

The previous prime is 1728409. The next prime is 1728439. The reversal of 1728420 is 248271.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14344 + ... + 14463.

It is an arithmetic number, because the mean of its divisors is an integer number (201656).

2^1728420 is an apocalyptic number.

1728420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1728420 is an abundant number, since it is smaller than the sum of its proper divisors (3111324).

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

1728420 is a wasteful number, since it uses less digits than its factorization.

1728420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28819 (or 28817 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1728420 is about 1314.6938807190. The cubic root of 1728420 is about 120.0097214346.

The spelling of 1728420 in words is "one million, seven hundred twenty-eight thousand, four hundred twenty".