1555434672 has 240 divisors, whose sum is σ = 4673700864. Its totient is φ = 444787200.

The previous prime is 1555434649. The next prime is 1555434679. The reversal of 1555434672 is 2764345551.

Its product of digits (504000) is a multiple of the sum of its prime factors (280).

It is not an unprimeable number, because it can be changed into a prime (1555434679) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9542463 + ... + 9542625.

Almost surely, 2^1555434672 is an apocalyptic number.

1555434672 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 1555434672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2336850432).

1555434672 is an abundant number, since it is smaller than the sum of its proper divisors (3118266192).

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

1555434672 is a wasteful number, since it uses less digits than its factorization.

1555434672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 263 counting only the distinct ones).

The product of its digits is 504000, while the sum is 42.

The square root of 1555434672 is about 39438.9993787875. Note that the first 3 decimals coincide. The cubic root of 1555434672 is about 1158.6455336280.

The spelling of 1555434672 in words is "one billion, five hundred fifty-five million, four hundred thirty-four thousand, six hundred seventy-two".