12201540 has 48 divisors (see below), whose sum is σ = 36794688. Its totient is φ = 3003264.

The previous prime is 12201509. The next prime is 12201557. The reversal of 12201540 is 4510221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 7042 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (766556).

Almost surely, 2^12201540 is an apocalyptic number.

12201540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12201540 is an abundant number, since it is smaller than the sum of its proper divisors (24593148).

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

12201540 is a wasteful number, since it uses less digits than its factorization.

12201540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15668 (or 15666 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 12201540 is about 3493.0702827169. The cubic root of 12201540 is about 230.2174377259.

Adding to 12201540 its reverse (4510221), we get a palindrome (16711761).

The spelling of 12201540 in words is "twelve million, two hundred one thousand, five hundred forty".