1331504240 has 40 divisors (see below), whose sum is σ = 3377181168. Its totient is φ = 484183040.

The previous prime is 1331504227. The next prime is 1331504257. The reversal of 1331504240 is 424051331.

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

It is a super-2 number, since 2×1331504240² = 3545807082275955200, which contains 22 as substring.

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, 755657 + ... + 757416.

Almost surely, 2^1331504240 is an apocalyptic number.

1331504240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331504240 is an abundant number, since it is smaller than the sum of its proper divisors (2045676928).

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

1331504240 is a wasteful number, since it uses less digits than its factorization.

1331504240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513097 (or 1513091 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1331504240 is about 36489.7826795392. The cubic root of 1331504240 is about 1100.1388915530.

Adding to 1331504240 its reverse (424051331), we get a palindrome (1755555571).

The spelling of 1331504240 in words is "one billion, three hundred thirty-one million, five hundred four thousand, two hundred forty".