1243630426 has 8 divisors (see below), whose sum is σ = 1870982100. Its totient is φ = 619969728.

The previous prime is 1243630397. The next prime is 1243630459. The reversal of 1243630426 is 6240363421.

It can be written as a sum of positive squares in 2 ways, for example, as 1243620225 + 10201 = 35265^2 + 101^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921901 + ... + 923248.

Almost surely, 2^1243630426 is an apocalyptic number.

1243630426 is a deficient number, since it is larger than the sum of its proper divisors (627351674).

1243630426 is a wasteful number, since it uses less digits than its factorization.

1243630426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845488.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1243630426 is about 35265.1446331927. The cubic root of 1243630426 is about 1075.3845175021.

Adding to 1243630426 its reverse (6240363421), we get a palindrome (7483993847).

The spelling of 1243630426 in words is "one billion, two hundred forty-three million, six hundred thirty thousand, four hundred twenty-six".