1311332240 has 40 divisors (see below), whose sum is σ = 3147203328. Its totient is φ = 507611520.

The previous prime is 1311332227. The next prime is 1311332249. The reversal of 1311332240 is 422331131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1311332249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261902 + ... + 266861.

Almost surely, 2^1311332240 is an apocalyptic number.

1311332240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311332240 is an abundant number, since it is smaller than the sum of its proper divisors (1835871088).

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

1311332240 is a wasteful number, since it uses less digits than its factorization.

1311332240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528807 (or 528801 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1311332240 is about 36212.3216598991. The cubic root of 1311332240 is about 1094.5549757804.

Adding to 1311332240 its reverse (422331131), we get a palindrome (1733663371).

The spelling of 1311332240 in words is "one billion, three hundred eleven million, three hundred thirty-two thousand, two hundred forty".