1555000004 has 24 divisors (see below), whose sum is σ = 2733675000. Its totient is φ = 773959680.

The previous prime is 1555000003. The next prime is 1555000009. The reversal of 1555000004 is 4000005551.

It can be written as a sum of positive squares in 4 ways, for example, as 76597504 + 1478402500 = 8752^2 + 38450^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1555000004.

It is not an unprimeable number, because it can be changed into a prime (1555000003) 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, 1244372 + ... + 1245620.

It is an arithmetic number, because the mean of its divisors is an integer number (113903125).

Almost surely, 2^1555000004 is an apocalyptic number.

It is an amenable number.

1555000004 is a deficient number, since it is larger than the sum of its proper divisors (1178674996).

1555000004 is a wasteful number, since it uses less digits than its factorization.

1555000004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2421 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 1555000004 is about 39433.4883569790. The cubic root of 1555000004 is about 1158.5375952992.

Adding to 1555000004 its reverse (4000005551), we get a palindrome (5555005555).

The spelling of 1555000004 in words is "one billion, five hundred fifty-five million, four", and thus it is an aban number.