1320403120 has 20 divisors (see below), whose sum is σ = 3069937440. Its totient is φ = 528161216.

The previous prime is 1320403111. The next prime is 1320403121. The reversal of 1320403120 is 213040231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1320403094 and 1320403103.

It is not an unprimeable number, because it can be changed into a prime (1320403121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8252440 + ... + 8252599.

It is an arithmetic number, because the mean of its divisors is an integer number (153496872).

Almost surely, 2^1320403120 is an apocalyptic number.

1320403120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320403120 is an abundant number, since it is smaller than the sum of its proper divisors (1749534320).

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

1320403120 is a wasteful number, since it uses less digits than its factorization.

1320403120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16505052 (or 16505046 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1320403120 is about 36337.3515820842. The cubic root of 1320403120 is about 1097.0729675662.

Adding to 1320403120 its reverse (213040231), we get a palindrome (1533443351).

The spelling of 1320403120 in words is "one billion, three hundred twenty million, four hundred three thousand, one hundred twenty".