1555405540 has 24 divisors (see below), whose sum is σ = 3517610040. Its totient is φ = 574303488.

The previous prime is 1555405529. The next prime is 1555405541. The reversal of 1555405540 is 455045551.

It can be written as a sum of positive squares in 4 ways, for example, as 84529636 + 1470875904 = 9194^2 + 38352^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1555405496 and 1555405505.

It is not an unprimeable number, because it can be changed into a prime (1555405541) by changing a digit.

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, 2990905 + ... + 2991424.

It is an arithmetic number, because the mean of its divisors is an integer number (146567085).

Almost surely, 2^1555405540 is an apocalyptic number.

1555405540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555405540 is an abundant number, since it is smaller than the sum of its proper divisors (1962204500).

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

1555405540 is a wasteful number, since it uses less digits than its factorization.

1555405540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5982351 (or 5982349 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 1555405540 is about 39438.6300472012. The cubic root of 1555405540 is about 1158.6383000932.

The spelling of 1555405540 in words is "one billion, five hundred fifty-five million, four hundred five thousand, five hundred forty".