12378553 has 4 divisors (see below), whose sum is σ = 13503888. Its totient is φ = 11253220.

The previous prime is 12378529. The next prime is 12378559. The reversal of 12378553 is 35587321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-12378553 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12378559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562651 + ... + 562672.

It is an arithmetic number, because the mean of its divisors is an integer number (3375972).

Almost surely, 2^12378553 is an apocalyptic number.

It is an amenable number.

12378553 is a deficient number, since it is larger than the sum of its proper divisors (1125335).

12378553 is a wasteful number, since it uses less digits than its factorization.

12378553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125334.

The product of its digits is 25200, while the sum is 34.

The square root of 12378553 is about 3518.3167850550. The cubic root of 12378553 is about 231.3253849187.

The spelling of 12378553 in words is "twelve million, three hundred seventy-eight thousand, five hundred fifty-three".