1553012440 has 128 divisors (see below), whose sum is σ = 4188672000. Its totient is φ = 506677248.

The previous prime is 1553012431. The next prime is 1553012479. The reversal of 1553012440 is 442103551.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1538656 + ... + 1539664.

It is an arithmetic number, because the mean of its divisors is an integer number (32724000).

Almost surely, 2^1553012440 is an apocalyptic number.

1553012440 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 1553012440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2094336000).

1553012440 is an abundant number, since it is smaller than the sum of its proper divisors (2635659560).

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

1553012440 is a wasteful number, since it uses less digits than its factorization.

1553012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1553012440 is about 39408.2788256478. The cubic root of 1553012440 is about 1158.0437797836.

Adding to 1553012440 its reverse (442103551), we get a palindrome (1995115991).

The spelling of 1553012440 in words is "one billion, five hundred fifty-three million, twelve thousand, four hundred forty".