1531448440 has 32 divisors (see below), whose sum is σ = 3525896880. Its totient is φ = 598332672.

The previous prime is 1531448437. The next prime is 1531448447. The reversal of 1531448440 is 448441351.

It is a junction number, because it is equal to n+sod(n) for n = 1531448396 and 1531448405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531448447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443469 + ... + 446908.

Almost surely, 2^1531448440 is an apocalyptic number.

1531448440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531448440 is an abundant number, since it is smaller than the sum of its proper divisors (1994448440).

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

1531448440 is a wasteful number, since it uses less digits than its factorization.

1531448440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890431 (or 890427 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 1531448440 is about 39133.7250974144. The cubic root of 1531448440 is about 1152.6588610668.

Adding to 1531448440 its reverse (448441351), we get a palindrome (1979889791).

The spelling of 1531448440 in words is "one billion, five hundred thirty-one million, four hundred forty-eight thousand, four hundred forty".