1123523540 has 96 divisors (see below), whose sum is σ = 2557215360. Its totient is φ = 413118464.

The previous prime is 1123523519. The next prime is 1123523581. The reversal of 1123523540 is 453253211.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3237647 + ... + 3237993.

It is an arithmetic number, because the mean of its divisors is an integer number (26637660).

Almost surely, 2^1123523540 is an apocalyptic number.

1123523540 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 1123523540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278607680).

1123523540 is an abundant number, since it is smaller than the sum of its proper divisors (1433691820).

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

1123523540 is a wasteful number, since it uses less digits than its factorization.

1123523540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1123523540 is about 33519.0026701273. The cubic root of 1123523540 is about 1039.5867255880.

Adding to 1123523540 its reverse (453253211), we get a palindrome (1576776751).

The spelling of 1123523540 in words is "one billion, one hundred twenty-three million, five hundred twenty-three thousand, five hundred forty".