12689478 has 24 divisors (see below), whose sum is σ = 28382016. Its totient is φ = 4093200.

The previous prime is 12689477. The next prime is 12689507. The reversal of 12689478 is 87498621.

It is a super-2 number, since 2×12689478² = 322045703824968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10813 + ... + 11928.

It is an arithmetic number, because the mean of its divisors is an integer number (1182584).

Almost surely, 2^12689478 is an apocalyptic number.

12689478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12689478 is an abundant number, since it is smaller than the sum of its proper divisors (15692538).

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

12689478 is a wasteful number, since it uses less digits than its factorization.

12689478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22780 (or 22777 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 12689478 is about 3562.2293581408. The cubic root of 12689478 is about 233.2462046577.

The spelling of 12689478 in words is "twelve million, six hundred eighty-nine thousand, four hundred seventy-eight".