12700042 has 4 divisors (see below), whose sum is σ = 19050066. Its totient is φ = 6350020.

The previous prime is 12700031. The next prime is 12700063. The reversal of 12700042 is 24000721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24000721 = 73 ⋅328777.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 19321 = 3561^2 + 139^2 .

It is a super-2 number, since 2×12700042² = 322582133603528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12699989 and 12700025.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3175009 + ... + 3175012.

Almost surely, 2^12700042 is an apocalyptic number.

12700042 is a deficient number, since it is larger than the sum of its proper divisors (6350024).

12700042 is an equidigital number, since it uses as much as digits as its factorization.

12700042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6350023.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 12700042 is about 3563.7118289783. The cubic root of 12700042 is about 233.3109125849.

Adding to 12700042 its reverse (24000721), we get a palindrome (36700763).

The spelling of 12700042 in words is "twelve million, seven hundred thousand, forty-two".