12387906 has 12 divisors (see below), whose sum is σ = 26840502. Its totient is φ = 4129296.

The previous prime is 12387887. The next prime is 12387937. The reversal of 12387906 is 60978321.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 793881 = 3405^2 + 891^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 344091 + ... + 344126.

Almost surely, 2^12387906 is an apocalyptic number.

12387906 is an abundant number, since it is smaller than the sum of its proper divisors (14452596).

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

12387906 is a wasteful number, since it uses less digits than its factorization.

12387906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688225 (or 688222 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 12387906 is about 3519.6457208077. The cubic root of 12387906 is about 231.3836319430.

The spelling of 12387906 in words is "twelve million, three hundred eighty-seven thousand, nine hundred six".