11403785920 has 112 divisors (see below), whose sum is σ = 28234952928. Its totient is φ = 4383498240.

The previous prime is 11403785909. The next prime is 11403785923. The reversal of 11403785920 is 2958730411.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (11403785923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872554 + ... + 885526.

It is an arithmetic number, because the mean of its divisors is an integer number (252097794).

Almost surely, 2^11403785920 is an apocalyptic number.

11403785920 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 11403785920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14117476464).

11403785920 is an abundant number, since it is smaller than the sum of its proper divisors (16831167008).

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

11403785920 is a wasteful number, since it uses less digits than its factorization.

11403785920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13098 (or 13088 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 11403785920 in words is "eleven billion, four hundred three million, seven hundred eighty-five thousand, nine hundred twenty".