11403431440 has 40 divisors (see below), whose sum is σ = 27129567168. Its totient is φ = 4455292800.

The previous prime is 11403431387. The next prime is 11403431449. The reversal of 11403431440 is 4413430411.

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

It is not an unprimeable number, because it can be changed into a prime (11403431449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1654036 + ... + 1660915.

Almost surely, 2^11403431440 is an apocalyptic number.

11403431440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11403431440 is an abundant number, since it is smaller than the sum of its proper divisors (15726135728).

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

11403431440 is a wasteful number, since it uses less digits than its factorization.

11403431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315007 (or 3315001 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 11403431440 its reverse (4413430411), we get a palindrome (15816861851).

The spelling of 11403431440 in words is "eleven billion, four hundred three million, four hundred thirty-one thousand, four hundred forty".