12689949 has 8 divisors (see below), whose sum is σ = 17239392. Its totient is φ = 8300240.

The previous prime is 12689923. The next prime is 12689969. The reversal of 12689949 is 94998621.

12689949 is digitally balanced in base 3, 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 12689949 - 2⁷ = 12689821 is a prime.

It is a super-2 number, since 2×12689949² = 322069611245202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12689898 and 12689907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689969) 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, 39747 + ... + 40064.

It is an arithmetic number, because the mean of its divisors is an integer number (2154924).

Almost surely, 2^12689949 is an apocalyptic number.

It is an amenable number.

12689949 is a deficient number, since it is larger than the sum of its proper divisors (4549443).

12689949 is an equidigital number, since it uses as much as digits as its factorization.

12689949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79867.

The product of its digits is 279936, while the sum is 48.

The square root of 12689949 is about 3562.2954678129. The cubic root of 12689949 is about 233.2490904502.

The spelling of 12689949 in words is "twelve million, six hundred eighty-nine thousand, nine hundred forty-nine".