1331244440 has 32 divisors (see below), whose sum is σ = 3040012080. Its totient is φ = 524548992.

The previous prime is 1331244437. The next prime is 1331244463. The reversal of 1331244440 is 444421331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245687 + ... + 251046.

Almost surely, 2^1331244440 is an apocalyptic number.

1331244440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331244440 is an abundant number, since it is smaller than the sum of its proper divisors (1708767640).

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

1331244440 is a wasteful number, since it uses less digits than its factorization.

1331244440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496811 (or 496807 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1331244440 is about 36486.2226052520. Note that the first 3 decimals coincide. The cubic root of 1331244440 is about 1100.0673347211.

Adding to 1331244440 its reverse (444421331), we get a palindrome (1775665771).

The spelling of 1331244440 in words is "one billion, three hundred thirty-one million, two hundred forty-four thousand, four hundred forty".