12661340 has 12 divisors (see below), whose sum is σ = 26588856. Its totient is φ = 5064528.

The previous prime is 12661321. The next prime is 12661357. The reversal of 12661340 is 4316621.

It is a happy number.

It is a super-3 number, since 3×12661340³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316514 + ... + 316553.

It is an arithmetic number, because the mean of its divisors is an integer number (2215738).

Almost surely, 2^12661340 is an apocalyptic number.

12661340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12661340 is an abundant number, since it is smaller than the sum of its proper divisors (13927516).

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

12661340 is a wasteful number, since it uses less digits than its factorization.

12661340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633076 (or 633074 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 12661340 is about 3558.2776732571. The cubic root of 12661340 is about 233.0736748724.

Adding to 12661340 its reverse (4316621), we get a palindrome (16977961).

The spelling of 12661340 in words is "twelve million, six hundred sixty-one thousand, three hundred forty".