11449171920 has 160 divisors (see below), whose sum is σ = 36026265600. Its totient is φ = 3007549440.

The previous prime is 11449171919. The next prime is 11449171939. The reversal of 11449171920 is 2917194411.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4540260 + ... + 4542780.

It is an arithmetic number, because the mean of its divisors is an integer number (225164160).

Almost surely, 2^11449171920 is an apocalyptic number.

11449171920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11449171920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18013132800).

11449171920 is an abundant number, since it is smaller than the sum of its proper divisors (24577093680).

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

11449171920 is a wasteful number, since it uses less digits than its factorization.

11449171920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813 (or 2807 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 11449171920 in words is "eleven billion, four hundred forty-nine million, one hundred seventy-one thousand, nine hundred twenty".