1123625640 has 128 divisors (see below), whose sum is σ = 3419136000. Its totient is φ = 295384320.

The previous prime is 1123625603. The next prime is 1123625641. The reversal of 1123625640 is 465263211.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1123625598 and 1123625607.

It is not an unprimeable number, because it can be changed into a prime (1123625641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5038569 + ... + 5038791.

It is an arithmetic number, because the mean of its divisors is an integer number (26712000).

Almost surely, 2^1123625640 is an apocalyptic number.

1123625640 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 1123625640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709568000).

1123625640 is an abundant number, since it is smaller than the sum of its proper divisors (2295510360).

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

1123625640 is a wasteful number, since it uses less digits than its factorization.

1123625640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1123625640 is about 33520.5256522030. The cubic root of 1123625640 is about 1039.6182153865.

Adding to 1123625640 its reverse (465263211), we get a palindrome (1588888851).

The spelling of 1123625640 in words is "one billion, one hundred twenty-three million, six hundred twenty-five thousand, six hundred forty".