12989640 has 32 divisors (see below), whose sum is σ = 38969280. Its totient is φ = 3463872.

The previous prime is 12989629. The next prime is 12989653. The reversal of 12989640 is 4698921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54004 + ... + 54243.

It is an arithmetic number, because the mean of its divisors is an integer number (1217790).

Almost surely, 2^12989640 is an apocalyptic number.

12989640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12989640 is an abundant number, since it is smaller than the sum of its proper divisors (25979640).

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

12989640 is a wasteful number, since it uses less digits than its factorization.

12989640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108261 (or 108257 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 12989640 is about 3604.1143156121. The cubic root of 12989640 is about 235.0709910767.

The spelling of 12989640 in words is "twelve million, nine hundred eighty-nine thousand, six hundred forty".