1247212426 has 4 divisors (see below), whose sum is σ = 1870818642. Its totient is φ = 623606212.

The previous prime is 1247212423. The next prime is 1247212441. The reversal of 1247212426 is 6242127421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6242127421 = 331 ⋅18858391.

It can be written as a sum of positive squares in only one way, i.e., 1023680025 + 223532401 = 31995^2 + 14951^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1247212423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311803105 + ... + 311803108.

Almost surely, 2^1247212426 is an apocalyptic number.

1247212426 is a deficient number, since it is larger than the sum of its proper divisors (623606216).

1247212426 is an equidigital number, since it uses as much as digits as its factorization.

1247212426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623606215.

The product of its digits is 10752, while the sum is 31.

The square root of 1247212426 is about 35315.8948067297. The cubic root of 1247212426 is about 1076.4159962184.

Adding to 1247212426 its reverse (6242127421), we get a palindrome (7489339847).

The spelling of 1247212426 in words is "one billion, two hundred forty-seven million, two hundred twelve thousand, four hundred twenty-six".