1555434972 has 144 divisors (see below), whose sum is σ = 4854001152. Its totient is φ = 408965760.

The previous prime is 1555434929. The next prime is 1555434977. The reversal of 1555434972 is 2794345551.

1555434972 is a `hidden beast` number, since 1 + 5 + 554 + 3 + 4 + 97 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555434977) 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 47 ways as a sum of consecutive naturals, for example, 1608033 + ... + 1608999.

Almost surely, 2^1555434972 is an apocalyptic number.

1555434972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555434972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427000576).

1555434972 is an abundant number, since it is smaller than the sum of its proper divisors (3298566180).

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

1555434972 is a wasteful number, since it uses less digits than its factorization.

1555434972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1483 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 1555434972 is about 39439.0031821292. The cubic root of 1555434972 is about 1158.6456081181.

The spelling of 1555434972 in words is "one billion, five hundred fifty-five million, four hundred thirty-four thousand, nine hundred seventy-two".