1555155140 has 192 divisors, whose sum is σ = 4274726400. Its totient is φ = 470776320.

The previous prime is 1555155139. The next prime is 1555155169. The reversal of 1555155140 is 415515551.

It is a junction number, because it is equal to n+sod(n) for n = 1555155097 and 1555155106.

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, 2791742 + ... + 2792298.

It is an arithmetic number, because the mean of its divisors is an integer number (22264200).

Almost surely, 2^1555155140 is an apocalyptic number.

1555155140 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 1555155140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2137363200).

1555155140 is an abundant number, since it is smaller than the sum of its proper divisors (2719571260).

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

1555155140 is a wasteful number, since it uses less digits than its factorization.

1555155140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 32.

The square root of 1555155140 is about 39435.4553669664. The cubic root of 1555155140 is about 1158.5761215396.

It can be divided in two parts, 15 and 55155140, that added together give a palindrome (55155155).

The spelling of 1555155140 in words is "one billion, five hundred fifty-five million, one hundred fifty-five thousand, one hundred forty".