1320840 has 64 divisors (see below), whose sum is σ = 4406400. Its totient is φ = 351936.

The previous prime is 1320811. The next prime is 1320859. The reversal of 1320840 is 480231.

It is a happy number.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 469 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (68850).

2^1320840 is an apocalyptic number.

1320840 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 1320840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203200).

1320840 is an abundant number, since it is smaller than the sum of its proper divisors (3085560).

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

1320840 is a wasteful number, since it uses less digits than its factorization.

1320840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1320840 is about 1149.2780342458. The cubic root of 1320840 is about 109.7193949909.

The spelling of 1320840 in words is "one million, three hundred twenty thousand, eight hundred forty".