1329440 has 48 divisors (see below), whose sum is σ = 3592512. Its totient is φ = 455424.

The previous prime is 1329439. The next prime is 1329457. The reversal of 1329440 is 449231.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (74844).

2^1329440 is an apocalyptic number.

1329440 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 1329440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796256).

1329440 is an abundant number, since it is smaller than the sum of its proper divisors (2263072).

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

1329440 is a wasteful number, since it uses less digits than its factorization.

1329440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1329440 is about 1153.0134431133. The cubic root of 1329440 is about 109.9570079927.

The spelling of 1329440 in words is "one million, three hundred twenty-nine thousand, four hundred forty".