1553722440 has 128 divisors (see below), whose sum is σ = 4788685440. Its totient is φ = 403070976.

The previous prime is 1553722433. The next prime is 1553722441. The reversal of 1553722440 is 442273551.

1553722440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1553722441) 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, 1821054 + ... + 1821906.

It is an arithmetic number, because the mean of its divisors is an integer number (37411605).

Almost surely, 2^1553722440 is an apocalyptic number.

1553722440 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 1553722440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2394342720).

1553722440 is an abundant number, since it is smaller than the sum of its proper divisors (3234963000).

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

1553722440 is a wasteful number, since it uses less digits than its factorization.

1553722440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 1553722440 is about 39417.2860557396. The cubic root of 1553722440 is about 1158.2202295007.

Adding to 1553722440 its reverse (442273551), we get a palindrome (1995995991).

The spelling of 1553722440 in words is "one billion, five hundred fifty-three million, seven hundred twenty-two thousand, four hundred forty".