1405728 has 48 divisors (see below), whose sum is σ = 4102560. Its totient is φ = 468288.

The previous prime is 1405721. The next prime is 1405751. The reversal of 1405728 is 8275041.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×1405728³ = 8333455889605165056, which contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1405721) 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, 51 + ... + 1677.

It is an arithmetic number, because the mean of its divisors is an integer number (85470).

2^1405728 is an apocalyptic number.

1405728 is a gapful number since it is divisible by the number (18) 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 1405728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2051280).

1405728 is an abundant number, since it is smaller than the sum of its proper divisors (2696832).

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

1405728 is a wasteful number, since it uses less digits than its factorization.

1405728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1632 counting only the distinct ones).

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

The square root of 1405728 is about 1185.6340076094. The cubic root of 1405728 is about 112.0212544696.

The spelling of 1405728 in words is "one million, four hundred five thousand, seven hundred twenty-eight".