1320235440 has 240 divisors, whose sum is σ = 4396194816. Its totient is φ = 327398400.

The previous prime is 1320235429. The next prime is 1320235447. The reversal of 1320235440 is 445320231.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1320235440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320235447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6256935 + ... + 6257145.

Almost surely, 2^1320235440 is an apocalyptic number.

1320235440 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 1320235440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2198097408).

1320235440 is an abundant number, since it is smaller than the sum of its proper divisors (3075959376).

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

1320235440 is a wasteful number, since it uses less digits than its factorization.

1320235440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 1320235440 is about 36335.0442410629. The cubic root of 1320235440 is about 1097.0265259454.

Adding to 1320235440 its reverse (445320231), we get a palindrome (1765555671).

The spelling of 1320235440 in words is "one billion, three hundred twenty million, two hundred thirty-five thousand, four hundred forty".