13555556 has 72 divisors (see below), whose sum is σ = 30030336. Its totient is φ = 5322240.

The previous prime is 13555547. The next prime is 13555561. The reversal of 13555556 is 65555531.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139700 + ... + 139796.

It is an arithmetic number, because the mean of its divisors is an integer number (417088).

Almost surely, 2^13555556 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 13555556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15015168).

13555556 is an abundant number, since it is smaller than the sum of its proper divisors (16474780).

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

13555556 is a wasteful number, since it uses less digits than its factorization.

13555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 160 counting only the distinct ones).

The product of its digits is 56250, while the sum is 35.

The square root of 13555556 is about 3681.7870660863. The cubic root of 13555556 is about 238.4363391072.

The spelling of 13555556 in words is "thirteen million, five hundred fifty-five thousand, five hundred fifty-six".