1361336240 has 80 divisors (see below), whose sum is σ = 3464778240. Its totient is φ = 493320960.

The previous prime is 1361336239. The next prime is 1361336267. The reversal of 1361336240 is 426331631.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267641 + ... + 272679.

It is an arithmetic number, because the mean of its divisors is an integer number (43309728).

Almost surely, 2^1361336240 is an apocalyptic number.

1361336240 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 1361336240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732389120).

1361336240 is an abundant number, since it is smaller than the sum of its proper divisors (2103442000).

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

1361336240 is a wasteful number, since it uses less digits than its factorization.

1361336240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5364 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1361336240 is about 36896.2903284327. The cubic root of 1361336240 is about 1108.2943910539.

Adding to 1361336240 its reverse (426331631), we get a palindrome (1787667871).

The spelling of 1361336240 in words is "one billion, three hundred sixty-one million, three hundred thirty-six thousand, two hundred forty".