1329840 has 60 divisors (see below), whose sum is σ = 4468464. Its totient is φ = 354432.

The previous prime is 1329799. The next prime is 1329847. The reversal of 1329840 is 489231.

It is a tau number, because it is divible by the number of its divisors (60).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1329847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204 + ... + 1643.

2^1329840 is an apocalyptic number.

1329840 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 1329840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2234232).

1329840 is an abundant number, since it is smaller than the sum of its proper divisors (3138624).

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

1329840 is a wasteful number, since it uses less digits than its factorization.

1329840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866 (or 1857 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1329840 is about 1153.1868885831. The cubic root of 1329840 is about 109.9680347892.

The spelling of 1329840 in words is "one million, three hundred twenty-nine thousand, eight hundred forty".