12406388 has 6 divisors (see below), whose sum is σ = 21711186. Its totient is φ = 6203192.

The previous prime is 12406369. The next prime is 12406391. The reversal of 12406388 is 88360421.

It can be written as a sum of positive squares in only one way, i.e., 11102224 + 1304164 = 3332^2 + 1142^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1550795 + ... + 1550802.

It is an arithmetic number, because the mean of its divisors is an integer number (3618531).

Almost surely, 2^12406388 is an apocalyptic number.

It is an amenable number.

12406388 is a deficient number, since it is larger than the sum of its proper divisors (9304798).

12406388 is a wasteful number, since it uses less digits than its factorization.

12406388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101601 (or 3101599 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 12406388 is about 3522.2702905938. The cubic root of 12406388 is about 231.4986448521.

The spelling of 12406388 in words is "twelve million, four hundred six thousand, three hundred eighty-eight".