13087998 has 144 divisors (see below), whose sum is σ = 38413440. Its totient is φ = 3175200.

The previous prime is 13087993. The next prime is 13088003. The reversal of 13087998 is 89978031.

It is an interprime number because it is at equal distance from previous prime (13087993) and next prime (13088003).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13087993) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 184303 + ... + 184373.

It is an arithmetic number, because the mean of its divisors is an integer number (266760).

Almost surely, 2^13087998 is an apocalyptic number.

13087998 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 13087998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19206720).

13087998 is an abundant number, since it is smaller than the sum of its proper divisors (25325442).

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

13087998 is a wasteful number, since it uses less digits than its factorization.

13087998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 13087998 is about 3617.7338210543. The cubic root of 13087998 is about 235.6628216650.

The spelling of 13087998 in words is "thirteen million, eighty-seven thousand, nine hundred ninety-eight".