13231998 has 80 divisors (see below), whose sum is σ = 32768736. Its totient is φ = 3965760.

The previous prime is 13231997. The next prime is 13232017. The reversal of 13231998 is 89913231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 128415 + ... + 128517.

Almost surely, 2^13231998 is an apocalyptic number.

13231998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13231998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16384368).

13231998 is an abundant number, since it is smaller than the sum of its proper divisors (19536738).

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

13231998 is a wasteful number, since it uses less digits than its factorization.

13231998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 182 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13231998 is about 3637.5813392968. The cubic root of 13231998 is about 236.5239603429.

It can be divided in two parts, 1323 and 1998, that added together give a triangular number (3321 = T₈₁).

The spelling of 13231998 in words is "thirteen million, two hundred thirty-one thousand, nine hundred ninety-eight".