12540142 has 8 divisors (see below), whose sum is σ = 18871632. Its totient is φ = 6249600.

The previous prime is 12540127. The next prime is 12540149. The reversal of 12540142 is 24104521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12540142² = 314510322760328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9459 + ... + 10702.

It is an arithmetic number, because the mean of its divisors is an integer number (2358954).

Almost surely, 2^12540142 is an apocalyptic number.

12540142 is a deficient number, since it is larger than the sum of its proper divisors (6331490).

12540142 is a wasteful number, since it uses less digits than its factorization.

12540142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20474.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12540142 is about 3541.2062916470. The cubic root of 12540142 is about 232.3276064331.

Adding to 12540142 its reverse (24104521), we get a palindrome (36644663).

The spelling of 12540142 in words is "twelve million, five hundred forty thousand, one hundred forty-two".