1578420 has 96 divisors (see below), whose sum is σ = 5107200. Its totient is φ = 404352.

The previous prime is 1578407. The next prime is 1578439. The reversal of 1578420 is 248751.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19941 + ... + 20019.

It is an arithmetic number, because the mean of its divisors is an integer number (53200).

2^1578420 is an apocalyptic number.

1578420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1578420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2553600).

1578420 is an abundant number, since it is smaller than the sum of its proper divisors (3528780).

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

1578420 is a wasteful number, since it uses less digits than its factorization.

1578420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1578420 is about 1256.3518615420. The cubic root of 1578420 is about 116.4324917266.

The spelling of 1578420 in words is "one million, five hundred seventy-eight thousand, four hundred twenty".