1331233640 has 64 divisors (see below), whose sum is σ = 3337148160. Its totient is φ = 473777920.

The previous prime is 1331233639. The next prime is 1331233669. The reversal of 1331233640 is 463321331.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11507 + ... + 52866.

It is an arithmetic number, because the mean of its divisors is an integer number (52142940).

Almost surely, 2^1331233640 is an apocalyptic number.

1331233640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331233640 is an abundant number, since it is smaller than the sum of its proper divisors (2005914520).

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

1331233640 is a wasteful number, since it uses less digits than its factorization.

1331233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64442 (or 64438 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 1331233640 is about 36486.0746038814. The cubic root of 1331233640 is about 1100.0643598707.

Adding to 1331233640 its reverse (463321331), we get a palindrome (1794554971).

The spelling of 1331233640 in words is "one billion, three hundred thirty-one million, two hundred thirty-three thousand, six hundred forty".