12540231 has 16 divisors (see below), whose sum is σ = 20267520. Its totient is φ = 7599960.

The previous prime is 12540217. The next prime is 12540259. The reversal of 12540231 is 13204521.

It is not a de Polignac number, because 12540231 - 2⁶ = 12540167 is a prime.

It is a super-2 number, since 2×12540231² = 314514787066722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20815 + ... + 21408.

It is an arithmetic number, because the mean of its divisors is an integer number (1266720).

Almost surely, 2^12540231 is an apocalyptic number.

12540231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12540231 is a deficient number, since it is larger than the sum of its proper divisors (7727289).

12540231 is a wasteful number, since it uses less digits than its factorization.

12540231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42243 (or 42237 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12540231 is about 3541.2188579640. The cubic root of 12540231 is about 232.3281560576.

Adding to 12540231 its reverse (13204521), we get a palindrome (25744752).

The spelling of 12540231 in words is "twelve million, five hundred forty thousand, two hundred thirty-one".