1284720 has 80 divisors (see below), whose sum is σ = 4097952. Its totient is φ = 332800.

The previous prime is 1284713. The next prime is 1284737. The reversal of 1284720 is 274821.

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

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12670 + ... + 12770.

2^1284720 is an apocalyptic number.

1284720 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 1284720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2048976).

1284720 is an abundant number, since it is smaller than the sum of its proper divisors (2813232).

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

1284720 is a wasteful number, since it uses less digits than its factorization.

1284720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 164 counting only the distinct ones).

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

The square root of 1284720 is about 1133.4548954414. The cubic root of 1284720 is about 108.7099998220.

The spelling of 1284720 in words is "one million, two hundred eighty-four thousand, seven hundred twenty".