12378817 has 8 divisors (see below), whose sum is σ = 13612032. Its totient is φ = 11163600.

The previous prime is 12378809. The next prime is 12378833. The reversal of 12378817 is 71887321.

12378817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12378817 - 2³ = 12378809 is a prime.

It is a super-2 number, since 2×12378817² = 306470220638978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12378917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3034 + ... + 5827.

It is an arithmetic number, because the mean of its divisors is an integer number (1701504).

Almost surely, 2^12378817 is an apocalyptic number.

It is an amenable number.

12378817 is a deficient number, since it is larger than the sum of its proper divisors (1233215).

12378817 is a wasteful number, since it uses less digits than its factorization.

12378817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999.

The product of its digits is 18816, while the sum is 37.

The square root of 12378817 is about 3518.3543027956. The cubic root of 12378817 is about 231.3270294153.

The spelling of 12378817 in words is "twelve million, three hundred seventy-eight thousand, eight hundred seventeen".