1428240 has 80 divisors (see below), whose sum is σ = 4838976. Its totient is φ = 345600.

The previous prime is 1428233. The next prime is 1428247. The reversal of 1428240 is 428241.

It is an interprime number because it is at equal distance from previous prime (1428233) and next prime (1428247).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2370 + ... + 2910.

2^1428240 is an apocalyptic number.

1428240 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 1428240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419488).

1428240 is an abundant number, since it is smaller than the sum of its proper divisors (3410736).

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

1428240 is a wasteful number, since it uses less digits than its factorization.

1428240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1428240 is about 1195.0899547733. The cubic root of 1428240 is about 112.6160777205.

Subtracting from 1428240 its reverse (428241), we obtain a palindrome (999999).

The spelling of 1428240 in words is "one million, four hundred twenty-eight thousand, two hundred forty".