1555142004 has 120 divisors (see below), whose sum is σ = 4393578728. Its totient is φ = 476824320.

The previous prime is 1555141967. The next prime is 1555142021. The reversal of 1555142004 is 4002415551.

It can be written as a sum of positive squares in 4 ways, for example, as 1205604 + 1553936400 = 1098^2 + 39420^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1772814 + ... + 1773690.

Almost surely, 2^1555142004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555142004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2196789364).

1555142004 is an abundant number, since it is smaller than the sum of its proper divisors (2838436724).

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

1555142004 is a wasteful number, since it uses less digits than its factorization.

1555142004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1555142004 is about 39435.2888159831. The cubic root of 1555142004 is about 1158.5728594644.

Adding to 1555142004 its reverse (4002415551), we get a palindrome (5557557555).

The spelling of 1555142004 in words is "one billion, five hundred fifty-five million, one hundred forty-two thousand, four".