12589978 has 4 divisors (see below), whose sum is σ = 18884970. Its totient is φ = 6294988.

The previous prime is 12589949. The next prime is 12590003. The reversal of 12589978 is 87998521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11108889 + 1481089 = 3333^2 + 1217^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3147493 + ... + 3147496.

Almost surely, 2^12589978 is an apocalyptic number.

12589978 is a deficient number, since it is larger than the sum of its proper divisors (6294992).

12589978 is an equidigital number, since it uses as much as digits as its factorization.

12589978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6294991.

The product of its digits is 362880, while the sum is 49.

The square root of 12589978 is about 3548.2358997113. The cubic root of 12589978 is about 232.6349653810.

It can be divided in two parts, 1258 and 9978, that added together give a square (11236 = 106²).

The spelling of 12589978 in words is "twelve million, five hundred eighty-nine thousand, nine hundred seventy-eight".