12919640 has 32 divisors (see below), whose sum is σ = 29252880. Its totient is φ = 5135232.

The previous prime is 12919637. The next prime is 12919649. The reversal of 12919640 is 4691921.

It is a junction number, because it is equal to n+sod(n) for n = 12919597 and 12919606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12919649) 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, 5987 + ... + 7853.

Almost surely, 2^12919640 is an apocalyptic number.

12919640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12919640 is an abundant number, since it is smaller than the sum of its proper divisors (16333240).

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

12919640 is a wasteful number, since it uses less digits than its factorization.

12919640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051 (or 2047 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 12919640 is about 3594.3900734339. The cubic root of 12919640 is about 234.6479714933.

The spelling of 12919640 in words is "twelve million, nine hundred nineteen thousand, six hundred forty".