12102440 has 32 divisors (see below), whose sum is σ = 31121280. Its totient is φ = 4149312.

The previous prime is 12102427. The next prime is 12102457. The reversal of 12102440 is 4420121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21332 + ... + 21891.

It is an arithmetic number, because the mean of its divisors is an integer number (972540).

Almost surely, 2^12102440 is an apocalyptic number.

12102440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12102440 is an abundant number, since it is smaller than the sum of its proper divisors (19018840).

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

12102440 is a wasteful number, since it uses less digits than its factorization.

12102440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43241 (or 43237 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12102440 is about 3478.8561338463. The cubic root of 12102440 is about 229.5924730543.

Adding to 12102440 its reverse (4420121), we get a palindrome (16522561).

The spelling of 12102440 in words is "twelve million, one hundred two thousand, four hundred forty".