1555100140 has 24 divisors (see below), whose sum is σ = 3562593552. Its totient is φ = 565490880.

The previous prime is 1555100119. The next prime is 1555100153. The reversal of 1555100140 is 410015551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3534099 + ... + 3534538.

It is an arithmetic number, because the mean of its divisors is an integer number (148441398).

Almost surely, 2^1555100140 is an apocalyptic number.

1555100140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555100140 is an abundant number, since it is smaller than the sum of its proper divisors (2007493412).

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

1555100140 is a wasteful number, since it uses less digits than its factorization.

1555100140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068657 (or 7068655 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1555100140 is about 39434.7580187834. The cubic root of 1555100140 is about 1158.5624632156.

Adding to 1555100140 its reverse (410015551), we get a palindrome (1965115691).

It can be divided in two parts, 15 and 55100140, that added together give a palindrome (55100155).

The spelling of 1555100140 in words is "one billion, five hundred fifty-five million, one hundred thousand, one hundred forty".