1329240 has 128 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 299520.

The previous prime is 1329233. The next prime is 1329241. The reversal of 1329240 is 429231.

1329240 = T₂₉ + T₃₀ + ... + T₁₉₉.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25054 + ... + 25106.

It is an arithmetic number, because the mean of its divisors is an integer number (36450).

2^1329240 is an apocalyptic number.

1329240 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 1329240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

1329240 is an abundant number, since it is smaller than the sum of its proper divisors (3336360).

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

1329240 is a wasteful number, since it uses less digits than its factorization.

1329240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1329240 is about 1152.9267105935. The cubic root of 1329240 is about 109.9514937651.

Subtracting from 1329240 its reverse (429231), we obtain a palindrome (900009).

The spelling of 1329240 in words is "one million, three hundred twenty-nine thousand, two hundred forty".