1329990 has 32 divisors (see below), whose sum is σ = 3269376. Its totient is φ = 346080.

The previous prime is 1329971. The next prime is 1330001. The reversal of 1329990 is 999231.

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, 775 + ... + 1805.

It is an arithmetic number, because the mean of its divisors is an integer number (102168).

2^1329990 is an apocalyptic number.

1329990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1329990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1634688).

1329990 is an abundant number, since it is smaller than the sum of its proper divisors (1939386).

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

1329990 is a wasteful number, since it uses less digits than its factorization.

1329990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 1329990 is about 1153.2519239091. The cubic root of 1329990 is about 109.9721692678.

It can be divided in two parts, 13 and 29990, that added together give a palindrome (30003).

The spelling of 1329990 in words is "one million, three hundred twenty-nine thousand, nine hundred ninety".