1553005440 has 512 divisors, whose sum is σ = 6474470400. Its totient is φ = 344383488.

The previous prime is 1553005427. The next prime is 1553005499. The reversal of 1553005440 is 445003551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4475347 + ... + 4475693.

It is an arithmetic number, because the mean of its divisors is an integer number (12645450).

Almost surely, 2^1553005440 is an apocalyptic number.

1553005440 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 1553005440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3237235200).

1553005440 is an abundant number, since it is smaller than the sum of its proper divisors (4921464960).

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

1553005440 is a wasteful number, since it uses less digits than its factorization.

1553005440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1553005440 is about 39408.1900117222. The cubic root of 1553005440 is about 1158.0420398709.

Adding to 1553005440 its reverse (445003551), we get a palindrome (1998008991).

The spelling of 1553005440 in words is "one billion, five hundred fifty-three million, five thousand, four hundred forty".