1281684 has 36 divisors (see below), whose sum is σ = 3121664. Its totient is φ = 409248.

The previous prime is 1281677. The next prime is 1281691. The reversal of 1281684 is 4861821.

It is an interprime number because it is at equal distance from previous prime (1281677) and next prime (1281691).

Its product of digits (3072) is a multiple of the sum of its prime factors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10029 + ... + 10155.

2^1281684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560832).

1281684 is an abundant number, since it is smaller than the sum of its proper divisors (1839980).

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

1281684 is a wasteful number, since it uses less digits than its factorization.

1281684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 161 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 1281684 is about 1132.1148351647. The cubic root of 1281684 is about 108.6242992067.

The spelling of 1281684 in words is "one million, two hundred eighty-one thousand, six hundred eighty-four".