1428720 has 40 divisors (see below), whose sum is σ = 4429776. Its totient is φ = 380928.

The previous prime is 1428709. The next prime is 1428751. The reversal of 1428720 is 278241.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2737 + ... + 3216.

2^1428720 is an apocalyptic number.

1428720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428720 is an abundant number, since it is smaller than the sum of its proper divisors (3001056).

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

1428720 is a wasteful number, since it uses less digits than its factorization.

1428720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5969 (or 5963 counting only the distinct ones).

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

The square root of 1428720 is about 1195.2907596062. The cubic root of 1428720 is about 112.6286922350.

The spelling of 1428720 in words is "one million, four hundred twenty-eight thousand, seven hundred twenty".