1123621644 has 48 divisors (see below), whose sum is σ = 2653344512. Its totient is φ = 370049472.

The previous prime is 1123621637. The next prime is 1123621663. The reversal of 1123621644 is 4461263211.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 756927 + ... + 758409.

Almost surely, 2^1123621644 is an apocalyptic number.

It is an amenable number.

1123621644 is an abundant number, since it is smaller than the sum of its proper divisors (1529722868).

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

1123621644 is a wasteful number, since it uses less digits than its factorization.

1123621644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206 (or 2204 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 1123621644 is about 33520.4660468795. The cubic root of 1123621644 is about 1039.6169829715.

Adding to 1123621644 its reverse (4461263211), we get a palindrome (5584884855).

The spelling of 1123621644 in words is "one billion, one hundred twenty-three million, six hundred twenty-one thousand, six hundred forty-four".