1553440044 has 48 divisors (see below), whose sum is σ = 3925393920. Its totient is φ = 475302720.

The previous prime is 1553440037. The next prime is 1553440061. The reversal of 1553440044 is 4400443551.

It is a junction number, because it is equal to n+sod(n) for n = 1553439993 and 1553440020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109 + ... + 55739.

It is an arithmetic number, because the mean of its divisors is an integer number (81779040).

Almost surely, 2^1553440044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553440044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962696960).

1553440044 is an abundant number, since it is smaller than the sum of its proper divisors (2371953876).

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

1553440044 is a wasteful number, since it uses less digits than its factorization.

1553440044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55830 (or 55828 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 1553440044 is about 39413.7037589720. The cubic root of 1553440044 is about 1158.1500546807.

Adding to 1553440044 its reverse (4400443551), we get a palindrome (5953883595).

The spelling of 1553440044 in words is "one billion, five hundred fifty-three million, four hundred forty thousand, forty-four".