13555998 has 24 divisors (see below), whose sum is σ = 30460248. Its totient is φ = 4518504.

The previous prime is 13555981. The next prime is 13555999. The reversal of 13555998 is 89955531.

13555998 is a `hidden beast` number, since 1 + 3 + 5 + 559 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13461 + ... + 14432.

It is an arithmetic number, because the mean of its divisors is an integer number (1269177).

Almost surely, 2^13555998 is an apocalyptic number.

13555998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13555998 is an abundant number, since it is smaller than the sum of its proper divisors (16904250).

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

13555998 is an equidigital number, since it uses as much as digits as its factorization.

13555998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27910 (or 27898 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 13555998 is about 3681.8470907956. The cubic root of 13555998 is about 238.4389306084.

The spelling of 13555998 in words is "thirteen million, five hundred fifty-five thousand, nine hundred ninety-eight".