12391470 has 192 divisors, whose sum is σ = 42456960. Its totient is φ = 2433024.

The previous prime is 12391469. The next prime is 12391481. The reversal of 12391470 is 7419321.

12391470 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 139186 + ... + 139274.

It is an arithmetic number, because the mean of its divisors is an integer number (221130).

Almost surely, 2^12391470 is an apocalyptic number.

12391470 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 12391470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21228480).

12391470 is an abundant number, since it is smaller than the sum of its proper divisors (30065490).

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

12391470 is a wasteful number, since it uses less digits than its factorization.

12391470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 12391470 is about 3520.1519853552. The cubic root of 12391470 is about 231.4058195022.

The spelling of 12391470 in words is "twelve million, three hundred ninety-one thousand, four hundred seventy".