1555250140 has 12 divisors (see below), whose sum is σ = 3266025336. Its totient is φ = 622100048.

The previous prime is 1555250093. The next prime is 1555250143. The reversal of 1555250140 is 410525551.

It is a junction number, because it is equal to n+sod(n) for n = 1555250099 and 1555250108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555250143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38881234 + ... + 38881273.

It is an arithmetic number, because the mean of its divisors is an integer number (272168778).

Almost surely, 2^1555250140 is an apocalyptic number.

1555250140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555250140 is an abundant number, since it is smaller than the sum of its proper divisors (1710775196).

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

1555250140 is a wasteful number, since it uses less digits than its factorization.

1555250140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77762516 (or 77762514 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 1555250140 is about 39436.6598484202. The cubic root of 1555250140 is about 1158.5997124315.

Adding to 1555250140 its reverse (410525551), we get a palindrome (1965775691).

It can be divided in two parts, 1555 and 250140, that added together give a triangular number (251695 = T₇₀₉).

The spelling of 1555250140 in words is "one billion, five hundred fifty-five million, two hundred fifty thousand, one hundred forty".