12961998 has 64 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 3627936.

The previous prime is 12961987. The next prime is 12962003. The reversal of 12961998 is 89916921.

12961998 is a `hidden beast` number, since 1 + 29 + 619 + 9 + 8 = 666.

12961998 is nontrivially palindromic in base 8.

12961998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×12961998³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19711 + ... + 20357.

It is an arithmetic number, because the mean of its divisors is an integer number (524880).

Almost surely, 2^12961998 is an apocalyptic number.

12961998 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 12961998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16796160).

12961998 is an abundant number, since it is smaller than the sum of its proper divisors (20630322).

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

12961998 is a wasteful number, since it uses less digits than its factorization.

12961998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 712 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 12961998 is about 3600.2774893055. The cubic root of 12961998 is about 234.9041286918.

The spelling of 12961998 in words is "twelve million, nine hundred sixty-one thousand, nine hundred ninety-eight".