12115640 has 16 divisors (see below), whose sum is σ = 27260280. Its totient is φ = 4846240.

The previous prime is 12115639. The next prime is 12115651. The reversal of 12115640 is 4651121.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 151406 + ... + 151485.

Almost surely, 2^12115640 is an apocalyptic number.

12115640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12115640 is an abundant number, since it is smaller than the sum of its proper divisors (15144640).

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

12115640 is a wasteful number, since it uses less digits than its factorization.

12115640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302902 (or 302898 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 12115640 is about 3480.7527921414. The cubic root of 12115640 is about 229.6759140654.

Adding to 12115640 its reverse (4651121), we get a palindrome (16766761).

The spelling of 12115640 in words is "twelve million, one hundred fifteen thousand, six hundred forty".