12699780 has 24 divisors (see below), whose sum is σ = 35559552. Its totient is φ = 3386592.

The previous prime is 12699779. The next prime is 12699787. The reversal of 12699780 is 8799621.

It is a super-2 number, since 2×12699780² = 322568824096800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12699787) 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, 105772 + ... + 105891.

It is an arithmetic number, because the mean of its divisors is an integer number (1481648).

Almost surely, 2^12699780 is an apocalyptic number.

12699780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12699780 is an abundant number, since it is smaller than the sum of its proper divisors (22859772).

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

12699780 is a wasteful number, since it uses less digits than its factorization.

12699780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211675 (or 211673 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 12699780 is about 3563.6750693631. The cubic root of 12699780 is about 233.3093081839.

The spelling of 12699780 in words is "twelve million, six hundred ninety-nine thousand, seven hundred eighty".