11423856640 has 192 divisors, whose sum is σ = 31524292800. Its totient is φ = 3892051968.

The previous prime is 11423856607. The next prime is 11423856649. The reversal of 11423856640 is 4665832411.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 11423856593 and 11423856602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11423856649) 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, 14120556 + ... + 14121364.

It is an arithmetic number, because the mean of its divisors is an integer number (164189025).

Almost surely, 2^11423856640 is an apocalyptic number.

11423856640 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 11423856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15762146400).

11423856640 is an abundant number, since it is smaller than the sum of its proper divisors (20100436160).

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

11423856640 is an equidigital number, since it uses as much as digits as its factorization.

11423856640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 11423856640 in words is "eleven billion, four hundred twenty-three million, eight hundred fifty-six thousand, six hundred forty".