1320735 has 24 divisors (see below), whose sum is σ = 2292624. Its totient is φ = 648960.

The previous prime is 1320731. The next prime is 1320749. The reversal of 1320735 is 5370231.

It is a happy number.

It is not a de Polignac number, because 1320735 - 2² = 1320731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2275 + ... + 2795.

It is an arithmetic number, because the mean of its divisors is an integer number (95526).

2^1320735 is an apocalyptic number.

1320735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1320735 is a deficient number, since it is larger than the sum of its proper divisors (971889).

1320735 is a wasteful number, since it uses less digits than its factorization.

1320735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 1320735 is about 1149.2323524858. The cubic root of 1320735 is about 109.7164875376.

Adding to 1320735 its reverse (5370231), we get a palindrome (6690966).

The spelling of 1320735 in words is "one million, three hundred twenty thousand, seven hundred thirty-five".