12939390 has 48 divisors (see below), whose sum is σ = 33976800. Its totient is φ = 3416256.

The previous prime is 12939389. The next prime is 12939391. The reversal of 12939390 is 9393921.

It is an interprime number because it is at equal distance from previous prime (12939389) and next prime (12939391).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12939391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9151 + ... + 10469.

It is an arithmetic number, because the mean of its divisors is an integer number (707850).

Almost surely, 2^12939390 is an apocalyptic number.

12939390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12939390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16988400).

12939390 is an abundant number, since it is smaller than the sum of its proper divisors (21037410).

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

12939390 is a wasteful number, since it uses less digits than its factorization.

12939390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1438 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 12939390 is about 3597.1363610517. The cubic root of 12939390 is about 234.7674778673.

The spelling of 12939390 in words is "twelve million, nine hundred thirty-nine thousand, three hundred ninety".