12400142 has 4 divisors (see below), whose sum is σ = 18600216. Its totient is φ = 6200070.

The previous prime is 12400127. The next prime is 12400169. The reversal of 12400142 is 24100421.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100034 + ... + 3100037.

It is an arithmetic number, because the mean of its divisors is an integer number (4650054).

Almost surely, 2^12400142 is an apocalyptic number.

12400142 is a deficient number, since it is larger than the sum of its proper divisors (6200074).

12400142 is an equidigital number, since it uses as much as digits as its factorization.

12400142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200073.

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

The square root of 12400142 is about 3521.3835349192. The cubic root of 12400142 is about 231.4597889751.

Adding to 12400142 its reverse (24100421), we get a palindrome (36500563).

The spelling of 12400142 in words is "twelve million, four hundred thousand, one hundred forty-two".