1428784 has 20 divisors (see below), whose sum is σ = 3163984. Its totient is φ = 612288.

The previous prime is 1428769. The next prime is 1428787. The reversal of 1428784 is 4878241.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1428787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6267 + ... + 6490.

2^1428784 is an apocalyptic number.

1428784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1428784 is an abundant number, since it is smaller than the sum of its proper divisors (1735200).

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

1428784 is a wasteful number, since it uses less digits than its factorization.

1428784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12772 (or 12766 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 1428784 is about 1195.3175310352. The cubic root of 1428784 is about 112.6303739568.

The spelling of 1428784 in words is "one million, four hundred twenty-eight thousand, seven hundred eighty-four".