1331223440 has 40 divisors (see below), whose sum is σ = 3229668288. Its totient is φ = 509336960.

The previous prime is 1331223379. The next prime is 1331223457. The reversal of 1331223440 is 443221331.

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 (23).

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, 359906 + ... + 363585.

Almost surely, 2^1331223440 is an apocalyptic number.

1331223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331223440 is an abundant number, since it is smaller than the sum of its proper divisors (1898444848).

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

1331223440 is a wasteful number, since it uses less digits than its factorization.

1331223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723527 (or 723521 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1331223440 is about 36485.9348242580. The cubic root of 1331223440 is about 1100.0615502749.

Adding to 1331223440 its reverse (443221331), we get a palindrome (1774444771).

The spelling of 1331223440 in words is "one billion, three hundred thirty-one million, two hundred twenty-three thousand, four hundred forty".