1555145040 has 160 divisors (see below), whose sum is σ = 5181632640. Its totient is φ = 384417792.

The previous prime is 1555145029. The next prime is 1555145063. The reversal of 1555145040 is 405415551.

1555145040 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1555144989 and 1555145007.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270516 + ... + 276204.

It is an arithmetic number, because the mean of its divisors is an integer number (32385204).

Almost surely, 2^1555145040 is an apocalyptic number.

1555145040 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 1555145040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590816320).

1555145040 is an abundant number, since it is smaller than the sum of its proper divisors (3626487600).

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

1555145040 is a wasteful number, since it uses less digits than its factorization.

1555145040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5789 (or 5783 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1555145040 is about 39435.3273094062. The cubic root of 1555145040 is about 1158.5736133988.

The spelling of 1555145040 in words is "one billion, five hundred fifty-five million, one hundred forty-five thousand, forty".