12931398 has 12 divisors (see below), whose sum is σ = 28018068. Its totient is φ = 4310460.

The previous prime is 12931393. The next prime is 12931409. The reversal of 12931398 is 89313921.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12931393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359188 + ... + 359223.

It is an arithmetic number, because the mean of its divisors is an integer number (2334839).

Almost surely, 2^12931398 is an apocalyptic number.

12931398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12931398 is an abundant number, since it is smaller than the sum of its proper divisors (15086670).

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

12931398 is a wasteful number, since it uses less digits than its factorization.

12931398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718419 (or 718416 counting only the distinct ones).

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

The square root of 12931398 is about 3596.0253058064. The cubic root of 12931398 is about 234.7191332878.

The spelling of 12931398 in words is "twelve million, nine hundred thirty-one thousand, three hundred ninety-eight".